Make HeadlessBrowserTestWithProxy use EmbeddedTestServer.

It was using the SpawnedTestServer, which is slow to start, and has
been a never ending source of flake.

HeadlessBrowserTest.ServerWantsClientCertificate will continue to use
the SpawnedTestServer, since the EmbeddedTestServer does not support
client cert requests.

Bug: 492672
Change-Id: I03a511abf63ee149704c908e838275f07b4e9903
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2508652
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Peter Kvitek <kvitekp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822727}

headless/lib/headless_browser_browsertest.cc

@@ -35,6 +35,7 @@
 #include "headless/public/headless_web_contents.h"
 #include "headless/test/headless_browser_test.h"
 #include "net/cert/cert_status_flags.h"
+#include "net/test/embedded_test_server/embedded_test_server.h"
 #include "net/test/spawned_test_server/spawned_test_server.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -192,8 +193,9 @@ IN_PROC_BROWSER_TEST_F(HeadlessBrowserTest, CreateWithBadURL) {
 class HeadlessBrowserTestWithProxy : public HeadlessBrowserTest {
  public:
   HeadlessBrowserTestWithProxy()
-      : proxy_server_(net::SpawnedTestServer::TYPE_HTTP,
-                      base::FilePath(FILE_PATH_LITERAL("headless/test/data"))) {
+      : proxy_server_(net::EmbeddedTestServer::TYPE_HTTP) {
+    proxy_server_.AddDefaultHandlers(
+        base::FilePath(FILE_PATH_LITERAL("headless/test/data")));
   }
 
   void SetUp() override {
@@ -202,14 +204,14 @@ class HeadlessBrowserTestWithProxy : public HeadlessBrowserTest {
   }
 
   void TearDown() override {
-    proxy_server_.Stop();
+    EXPECT_TRUE(proxy_server_.ShutdownAndWaitUntilComplete());
     HeadlessBrowserTest::TearDown();
   }
 
-  net::SpawnedTestServer* proxy_server() { return &proxy_server_; }
+  net::EmbeddedTestServer* proxy_server() { return &proxy_server_; }
 
  private:
-  net::SpawnedTestServer proxy_server_;
+  net::EmbeddedTestServer proxy_server_;
 };
 
 #if defined(NO_WIN_FLAKES) || (defined(OS_MAC) && defined(ADDRESS_SANITIZER))

headless/test/data/protocol/sanity/browser-set-proxy-config-expected.txt

@@ -2,4 +2,4 @@ Tests that headless session can configure proxy.
 
 No proxy: Page with body
 Proxied to itself: Page with body
-Proxied to another server: Default response given for path: http://not-an-actual-domain.tld/hello.html
+Proxied to another server: Hello headless world!

headless/test/headless_protocol_browsertest.cc

@@ -11,7 +11,7 @@
 #include "base/json/json_reader.h"
 #include "base/path_service.h"
 #include "headless/app/headless_shell_switches.h"
-#include "net/test/spawned_test_server/spawned_test_server.h"
+#include "net/test/embedded_test_server/embedded_test_server.h"
 #include "services/network/public/cpp/network_switches.h"
 
 namespace headless {
@@ -267,8 +267,9 @@ class HeadlessProtocolBrowserTestWithProxy
     : public HeadlessProtocolBrowserTest {
  public:
   HeadlessProtocolBrowserTestWithProxy()
-      : proxy_server_(net::SpawnedTestServer::TYPE_HTTP,
-                      base::FilePath(FILE_PATH_LITERAL("headless/test/data"))) {
+      : proxy_server_(net::EmbeddedTestServer::TYPE_HTTP) {
+    proxy_server_.AddDefaultHandlers(
+        base::FilePath(FILE_PATH_LITERAL("headless/test/data")));
   }
 
   void SetUp() override {
@@ -277,11 +278,11 @@ class HeadlessProtocolBrowserTestWithProxy
   }
 
   void TearDown() override {
-    proxy_server_.Stop();
+    EXPECT_TRUE(proxy_server_.ShutdownAndWaitUntilComplete());
     HeadlessProtocolBrowserTest::TearDown();
   }
 
-  net::SpawnedTestServer* proxy_server() { return &proxy_server_; }
+  net::EmbeddedTestServer* proxy_server() { return &proxy_server_; }
 
  protected:
   std::vector<std::string> GetPageUrlExtraParams() override {
@@ -290,7 +291,7 @@ class HeadlessProtocolBrowserTestWithProxy
   }
 
  private:
-  net::SpawnedTestServer proxy_server_;
+  net::EmbeddedTestServer proxy_server_;
 };
 
 // BeginFrameControl is not supported on MacOS yet, see: https://cs.chromium.org