[iOS] Adds a version check function for iOS 7.

BUG=None
TEST=None

Review URL: https://chromiumcodereview.appspot.com/18171002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@209314 0039d316-1c4b-4281-b951-d872f2087c98

base/ios/ios_util.h

@@ -11,10 +11,13 @@
 namespace base {
 namespace ios {
 
-// Returns whether the operation system is iOS 6 or later.
+// Returns whether the operating system is iOS 6 or later.
 BASE_EXPORT bool IsRunningOnIOS6OrLater();
 
-// Returns whether the operation system is at the given version or later.
+// Returns whether the operating system is iOS 7 or later.
+BASE_EXPORT bool IsRunningOnIOS7OrLater();
+
+// Returns whether the operating system is at the given version or later.
 BASE_EXPORT bool IsRunningOnOrLater(int32 major, int32 minor, int32 bug_fix);
 
 }  // namespace ios

base/ios/ios_util.mm

@@ -24,6 +24,10 @@ bool IsRunningOnIOS6OrLater() {
   return IsRunningOnOrLater(6, 0, 0);
 }
 
+bool IsRunningOnIOS7OrLater() {
+  return IsRunningOnOrLater(7, 0, 0);
+}
+
 bool IsRunningOnOrLater(int32 major, int32 minor, int32 bug_fix) {
   static const int32* current_version = OSVersionAsArray();
   int32 version[] = { major, minor, bug_fix };