diff --git a/apps/launcher.cc b/apps/launcher.cc
index f4875aae2f3f9e..25c3a5f2bd14e4 100644
--- a/apps/launcher.cc
+++ b/apps/launcher.cc
@@ -328,7 +328,7 @@ void LaunchPlatformAppWithCommandLine(Profile* profile,
 
 #if defined(OS_WIN)
   base::CommandLine::StringType about_blank_url(
-      base::ASCIIToWide(url::kAboutBlankURL));
+      base::ASCIIToUTF16(url::kAboutBlankURL));
 #else
   base::CommandLine::StringType about_blank_url(url::kAboutBlankURL);
 #endif
diff --git a/components/crash/app/breakpad_win.cc b/components/crash/app/breakpad_win.cc
index 32c48915426e71..862174cab411e8 100644
--- a/components/crash/app/breakpad_win.cc
+++ b/components/crash/app/breakpad_win.cc
@@ -508,7 +508,7 @@ void InitCrashReporter(const std::string& process_type_switch) {
   // Disable the message box for assertions.
   _CrtSetReportMode(_CRT_ASSERT, 0);
 
-  std::wstring process_type = base::ASCIIToWide(process_type_switch);
+  base::string16 process_type = base::ASCIIToUTF16(process_type_switch);
   if (process_type.empty())
     process_type = L"browser";
 
@@ -555,7 +555,7 @@ void InitCrashReporter(const std::string& process_type_switch) {
       InitDefaultCrashCallback(default_filter);
     return;
   }
-  std::wstring pipe_name = base::ASCIIToWide(pipe_name_ascii);
+  base::string16 pipe_name = base::ASCIIToUTF16(pipe_name_ascii);
 
 #ifdef _WIN64
   // The protocol for connecting to the out-of-process Breakpad crash
diff --git a/components/policy/core/common/policy_loader_win_unittest.cc b/components/policy/core/common/policy_loader_win_unittest.cc
index 8c0975e1f02d55..708ef6685a4ce4 100644
--- a/components/policy/core/common/policy_loader_win_unittest.cc
+++ b/components/policy/core/common/policy_loader_win_unittest.cc
@@ -155,7 +155,7 @@ class ScopedGroupPolicyRegistrySandbox {
   // Deletes the sandbox keys.
   void DeleteKeys();
 
-  std::wstring key_name_;
+  base::string16 key_name_;
 
   // Keys are created for the lifetime of a test to contain
   // the sandboxed HKCU and HKLM hives, respectively.
@@ -296,7 +296,7 @@ ScopedGroupPolicyRegistrySandbox::ScopedGroupPolicyRegistrySandbox() {
   // Generate a unique registry key for the override for each test. This
   // makes sure that tests executing in parallel won't delete each other's
   // key, at DeleteKeys().
-  key_name_ = base::ASCIIToWide(base::StringPrintf(
+  key_name_ = base::ASCIIToUTF16(base::StringPrintf(
         "SOFTWARE\\chromium unittest %d", base::GetCurrentProcId()));
   std::wstring hklm_key_name = key_name_ + L"\\HKLM";
   std::wstring hkcu_key_name = key_name_ + L"\\HKCU";
diff --git a/content/browser/download/save_package_unittest.cc b/content/browser/download/save_package_unittest.cc
index 0d3b31fde497fc..c0dcbf0a7ebefc 100644
--- a/content/browser/download/save_package_unittest.cc
+++ b/content/browser/download/save_package_unittest.cc
@@ -242,7 +242,7 @@ TEST_F(SavePackageTest, MAYBE_TestLongSafePureFilename) {
   const base::FilePath::StringType ext(FPL_HTML_EXTENSION);
   base::FilePath::StringType filename =
 #if defined(OS_WIN)
-      base::ASCIIToWide(long_file_name);
+      base::ASCIIToUTF16(long_file_name);
 #else
       long_file_name;
 #endif
diff --git a/content/test/plugin/plugin_geturl_test.cc b/content/test/plugin/plugin_geturl_test.cc
index 825c75a1390423..ed686f2a848088 100644
--- a/content/test/plugin/plugin_geturl_test.cc
+++ b/content/test/plugin/plugin_geturl_test.cc
@@ -206,7 +206,7 @@ NPError PluginGetURLTest::NewStream(NPMIMEType type, NPStream* stream,
 #if defined(OS_WIN)
         filename = filename.substr(8);  // remove "file:///"
         // Assume an ASCII path on Windows.
-        base::FilePath path = base::FilePath(base::ASCIIToWide(filename));
+        base::FilePath path = base::FilePath(base::ASCIIToUTF16(filename));
 #else
         filename = filename.substr(7);  // remove "file://"
         base::FilePath path = base::FilePath(filename);
diff --git a/ipc/ipc_channel_win.cc b/ipc/ipc_channel_win.cc
index 870cf53245c9a6..db8c96116e3e71 100644
--- a/ipc/ipc_channel_win.cc
+++ b/ipc/ipc_channel_win.cc
@@ -231,13 +231,13 @@ const base::string16 ChannelWin::PipeName(
   if (index != std::string::npos) {
     if (secret)  // Retrieve the secret if asked for.
       base::StringToInt(channel_id.substr(index + 1), secret);
-    return base::ASCIIToWide(name.append(channel_id.substr(0, index - 1)));
+    return base::ASCIIToUTF16(name.append(channel_id.substr(0, index - 1)));
   }
 
   // This case is here to support predictable named pipes in tests.
   if (secret)
     *secret = 0;
-  return base::ASCIIToWide(name.append(channel_id));
+  return base::ASCIIToUTF16(name.append(channel_id));
 }
 
 bool ChannelWin::CreatePipe(const IPC::ChannelHandle &channel_handle,
diff --git a/media/audio/win/audio_device_listener_win_unittest.cc b/media/audio/win/audio_device_listener_win_unittest.cc
index 14b70a8fe90a10..49a13592766e95 100644
--- a/media/audio/win/audio_device_listener_win_unittest.cc
+++ b/media/audio/win/audio_device_listener_win_unittest.cc
@@ -47,7 +47,7 @@ class AudioDeviceListenerWinTest : public testing::Test {
   bool SimulateDefaultOutputDeviceChange(const char* new_device_id) {
     return output_device_listener_->OnDefaultDeviceChanged(
         static_cast<EDataFlow>(eConsole), static_cast<ERole>(eRender),
-        base::ASCIIToWide(new_device_id).c_str()) == S_OK;
+        base::ASCIIToUTF16(new_device_id).c_str()) == S_OK;
   }
 
   void SetOutputDeviceId(std::string new_device_id) {
diff --git a/net/base/keygen_handler_win.cc b/net/base/keygen_handler_win.cc
index ffa3b2e414e665..44365fa136db23 100644
--- a/net/base/keygen_handler_win.cc
+++ b/net/base/keygen_handler_win.cc
@@ -65,7 +65,7 @@ bool GetSubjectPublicKeyInfo(HCRYPTPROV prov, std::vector<BYTE>* output) {
 bool GetSignedPublicKeyAndChallenge(HCRYPTPROV prov,
                                     const std::string& challenge,
                                     std::string* output) {
-  std::wstring wide_challenge = base::ASCIIToWide(challenge);
+  base::string16 challenge16 = base::ASCIIToUTF16(challenge);
   std::vector<BYTE> spki;
 
   if (!GetSubjectPublicKeyInfo(prov, &spki))
@@ -79,7 +79,7 @@ bool GetSignedPublicKeyAndChallenge(HCRYPTPROV prov,
   pkac.dwVersion = CERT_KEYGEN_REQUEST_V1;
   pkac.SubjectPublicKeyInfo =
       *reinterpret_cast<PCERT_PUBLIC_KEY_INFO>(&spki[0]);
-  pkac.pwszChallengeString = const_cast<wchar_t*>(wide_challenge.c_str());
+  pkac.pwszChallengeString = const_cast<base::char16*>(challenge16.c_str());
 
   CRYPT_ALGORITHM_IDENTIFIER sig_alg;
   memset(&sig_alg, 0, sizeof(sig_alg));
diff --git a/net/cert/cert_verify_proc_win.cc b/net/cert/cert_verify_proc_win.cc
index 60e22865e5a1a5..13a337bfe2f54f 100644
--- a/net/cert/cert_verify_proc_win.cc
+++ b/net/cert/cert_verify_proc_win.cc
@@ -741,7 +741,7 @@ int CertVerifyProcWin::VerifyInternal(
   if (CertSubjectCommonNameHasNull(cert_handle))
     verify_result->cert_status |= CERT_STATUS_INVALID;
 
-  std::wstring wstr_hostname = base::ASCIIToWide(hostname);
+  base::string16 hostname16 = base::ASCIIToUTF16(hostname);
 
   SSL_EXTRA_CERT_CHAIN_POLICY_PARA extra_policy_para;
   memset(&extra_policy_para, 0, sizeof(extra_policy_para));
@@ -752,7 +752,7 @@ int CertVerifyProcWin::VerifyInternal(
   extra_policy_para.fdwChecks =
       0x00001000;  // SECURITY_FLAG_IGNORE_CERT_CN_INVALID
   extra_policy_para.pwszServerName =
-      const_cast<wchar_t*>(wstr_hostname.c_str());
+      const_cast<base::char16*>(hostname16.c_str());
 
   CERT_CHAIN_POLICY_PARA policy_para;
   memset(&policy_para, 0, sizeof(policy_para));
diff --git a/net/http/http_auth_sspi_win.cc b/net/http/http_auth_sspi_win.cc
index 66038d122d64b6..156a55f7ed87d1 100644
--- a/net/http/http_auth_sspi_win.cc
+++ b/net/http/http_auth_sspi_win.cc
@@ -360,11 +360,11 @@ int HttpAuthSSPI::GetNextSecurityToken(
 
   // This returns a token that is passed to the remote server.
   DWORD context_attribute;
-  std::wstring spn_wide = base::ASCIIToWide(spn);
+  base::string16 spn16 = base::ASCIIToUTF16(spn);
   SECURITY_STATUS status = library_->InitializeSecurityContext(
       &cred_,  // phCredential
       ctxt_ptr,  // phContext
-      const_cast<wchar_t *>(spn_wide.c_str()),  // pszTargetName
+      const_cast<base::char16*>(spn16.c_str()),  // pszTargetName
       context_flags,  // fContextReq
       0,  // Reserved1 (must be 0)
       SECURITY_NATIVE_DREP,  // TargetDataRep
diff --git a/net/http/url_security_manager_win.cc b/net/http/url_security_manager_win.cc
index 4e2d938963eeee..db5620ffa76f08 100644
--- a/net/http/url_security_manager_win.cc
+++ b/net/http/url_security_manager_win.cc
@@ -53,10 +53,10 @@ bool URLSecurityManagerWin::CanUseDefaultCredentials(
   if (!const_cast<URLSecurityManagerWin*>(this)->EnsureSystemSecurityManager())
     return false;
 
-  std::wstring url_w = base::ASCIIToWide(auth_origin.spec());
+  base::string16 url16 = base::ASCIIToUTF16(auth_origin.spec());
   DWORD policy = 0;
   HRESULT hr;
-  hr = security_manager_->ProcessUrlAction(url_w.c_str(),
+  hr = security_manager_->ProcessUrlAction(url16.c_str(),
                                            URLACTION_CREDENTIALS_USE,
                                            reinterpret_cast<BYTE*>(&policy),
                                            sizeof(policy), NULL, 0,
@@ -84,7 +84,7 @@ bool URLSecurityManagerWin::CanUseDefaultCredentials(
       // URLZONE_INTERNET      3
       // URLZONE_UNTRUSTED     4
       DWORD zone = 0;
-      hr = security_manager_->MapUrlToZone(url_w.c_str(), &zone, 0);
+      hr = security_manager_->MapUrlToZone(url16.c_str(), &zone, 0);
       if (FAILED(hr)) {
         LOG(ERROR) << "IInternetSecurityManager::MapUrlToZone failed: " << hr;
         return false;
diff --git a/net/proxy/proxy_resolver_winhttp.cc b/net/proxy/proxy_resolver_winhttp.cc
index 2d90dab6e05f48..755a1bfe2f485f 100644
--- a/net/proxy/proxy_resolver_winhttp.cc
+++ b/net/proxy/proxy_resolver_winhttp.cc
@@ -54,8 +54,8 @@ int ProxyResolverWinHttp::GetProxyForURL(const GURL& query_url,
   WINHTTP_AUTOPROXY_OPTIONS options = {0};
   options.fAutoLogonIfChallenged = FALSE;
   options.dwFlags = WINHTTP_AUTOPROXY_CONFIG_URL;
-  std::wstring pac_url_wide = base::ASCIIToWide(pac_url_.spec());
-  options.lpszAutoConfigUrl = pac_url_wide.c_str();
+  base::string16 pac_url16 = base::ASCIIToUTF16(pac_url_.spec());
+  options.lpszAutoConfigUrl = pac_url16.c_str();
 
   WINHTTP_PROXY_INFO info = {0};
   DCHECK(session_handle_);
@@ -66,13 +66,13 @@ int ProxyResolverWinHttp::GetProxyForURL(const GURL& query_url,
   // get good performance in the case where WinHTTP uses an out-of-process
   // resolver.  This is important for Vista and Win2k3.
   BOOL ok = WinHttpGetProxyForUrl(session_handle_,
-                                  base::ASCIIToWide(query_url.spec()).c_str(),
+                                  base::ASCIIToUTF16(query_url.spec()).c_str(),
                                   &options, &info);
   if (!ok) {
     if (ERROR_WINHTTP_LOGIN_FAILURE == GetLastError()) {
       options.fAutoLogonIfChallenged = TRUE;
       ok = WinHttpGetProxyForUrl(
-          session_handle_, base::ASCIIToWide(query_url.spec()).c_str(),
+          session_handle_, base::ASCIIToUTF16(query_url.spec()).c_str(),
           &options, &info);
     }
     if (!ok) {
diff --git a/tools/imagediff/image_diff.cc b/tools/imagediff/image_diff.cc
index 936bf5d17f41fc..6a9ebb9f938010 100644
--- a/tools/imagediff/image_diff.cc
+++ b/tools/imagediff/image_diff.cc
@@ -397,7 +397,7 @@ int DiffImages(const base::FilePath& file1, const base::FilePath& file2,
 // paths as non-wide strings anyway.
 base::FilePath FilePathFromASCII(const std::string& str) {
 #if defined(OS_WIN)
-  return base::FilePath(base::ASCIIToWide(str));
+  return base::FilePath(base::ASCIIToUTF16(str));
 #else
   return base::FilePath(str);
 #endif
diff --git a/ui/base/clipboard/clipboard_win.cc b/ui/base/clipboard/clipboard_win.cc
index f37f0772cadf29..b46aba58bc05d6 100644
--- a/ui/base/clipboard/clipboard_win.cc
+++ b/ui/base/clipboard/clipboard_win.cc
@@ -136,7 +136,7 @@ HGLOBAL CreateGlobalData(const std::basic_string<charT>& str) {
     ::GlobalUnlock(data);
   }
   return data;
-};
+}
 
 bool BitmapHasInvalidPremultipliedColors(const SkBitmap& bitmap) {
   for (int x = 0; x < bitmap.width(); ++x) {
@@ -238,7 +238,7 @@ bool Clipboard::FormatType::Equals(const FormatType& other) const {
 Clipboard::FormatType Clipboard::GetFormatType(
     const std::string& format_string) {
   return FormatType(
-      ::RegisterClipboardFormat(base::ASCIIToWide(format_string).c_str()));
+      ::RegisterClipboardFormat(base::ASCIIToUTF16(format_string).c_str()));
 }
 
 // static
@@ -727,7 +727,7 @@ void ClipboardWin::WriteBookmark(const char* title_data,
   bookmark.append(1, L'\n');
   bookmark.append(url_data, url_len);
 
-  base::string16 wide_bookmark = base::UTF8ToWide(bookmark);
+  base::string16 wide_bookmark = base::UTF8ToUTF16(bookmark);
   HGLOBAL glob = CreateGlobalData(wide_bookmark);
 
   WriteToClipboard(GetUrlWFormatType().ToFormatEtc().cfFormat, glob);
diff --git a/win8/delegate_execute/delegate_execute_util_unittest.cc b/win8/delegate_execute/delegate_execute_util_unittest.cc
index 40a2e7144bb6de..49c1776b7e68a3 100644
--- a/win8/delegate_execute/delegate_execute_util_unittest.cc
+++ b/win8/delegate_execute/delegate_execute_util_unittest.cc
@@ -29,7 +29,7 @@ TEST(DelegateExecuteUtil, CommandLineFromParametersTest) {
   // Parameters with a switch are parsed properly.
   cl = delegate_execute::CommandLineFromParameters(
       base::StringPrintf(L"--%ls",
-                         base::ASCIIToWide(kSomeSwitch).c_str()).c_str());
+                         base::ASCIIToUTF16(kSomeSwitch).c_str()).c_str());
   EXPECT_EQ(std::wstring(), cl.GetProgram().value());
   EXPECT_TRUE(cl.HasSwitch(kSomeSwitch));
 }
@@ -62,7 +62,7 @@ TEST(DelegateExecuteUtil, MakeChromeCommandLineTest) {
   cl = delegate_execute::MakeChromeCommandLine(
       this_exe, delegate_execute::CommandLineFromParameters(
           base::StringPrintf(L"--%ls -- %ls",
-                             base::ASCIIToWide(kSomeSwitch).c_str(),
+                             base::ASCIIToUTF16(kSomeSwitch).c_str(),
                              kOtherArgument).c_str()),
       base::string16(kSomeArgument));
   EXPECT_EQ(5, cl.argv().size());