Update {virtual,override,final} to follow C++11 style in chrome/browser/chromeos/login.

chrome/browser/chromeos/login/mixin_based_browser_test.h

Index: chrome/browser/chromeos/login/mixin_based_browser_test.h
diff --git a/chrome/browser/chromeos/login/mixin_based_browser_test.h b/chrome/browser/chromeos/login/mixin_based_browser_test.h
index a5a5f71910e9d34a1041525afcc537a33d3dfcf5..856c8cf8e97e1e2b73c4cb639b932d6d46e31406 100644
--- a/chrome/browser/chromeos/login/mixin_based_browser_test.h
+++ b/chrome/browser/chromeos/login/mixin_based_browser_test.h
@@ -55,14 +55,14 @@ class MixinBasedBrowserTest : public InProcessBrowserTest {
   };
 
   MixinBasedBrowserTest();
-  virtual ~MixinBasedBrowserTest();
+  ~MixinBasedBrowserTest() override;
 
   // Override from InProcessBrowserTest.
-  virtual void SetUpCommandLine(base::CommandLine* command_line) override;
-  virtual void SetUpInProcessBrowserTestFixture() override;
-  virtual void SetUpOnMainThread() override;
-  virtual void TearDownOnMainThread() override;
-  virtual void TearDownInProcessBrowserTestFixture() override;
+  void SetUpCommandLine(base::CommandLine* command_line) override;
+  void SetUpInProcessBrowserTestFixture() override;
+  void SetUpOnMainThread() override;
+  void TearDownOnMainThread() override;
+  void TearDownInProcessBrowserTestFixture() override;
 
  protected:
   // Adds |mixin| as an mixin for this test, passing ownership