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

chrome/browser/chromeos/login/screenshot_testing/screenshot_testing_mixin.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_SCREENSHOT_TESTING_SCREENSHOT_TESTING_MIXIN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENSHOT_TESTING_SCREENSHOT_TESTING_MIXIN_H_
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/timer/timer.h"
 #include "chrome/browser/chromeos/login/mixin_based_browser_test.h"
 #include "chrome/browser/chromeos/login/screenshot_testing/screenshot_tester.h"
 #include "content/public/test/browser_test_base.h"
 
 namespace chromeos {
 
 // Base mixin class for tests which support testing with screenshots.
 // Sets up everything required for taking screenshots.
 // Provides functionality to deal with animation load: screenshots
 // should be taken only when all the animation is loaded.
 class ScreenshotTestingMixin : public MixinBasedBrowserTest::Mixin {
  public:
   ScreenshotTestingMixin();
-  virtual ~ScreenshotTestingMixin();
+  ~ScreenshotTestingMixin() override;
 
   // Override from BrowsertestBase::Mixin.
-  virtual void SetUpInProcessBrowserTestFixture() override;
+  void SetUpInProcessBrowserTestFixture() override;
 
   // Override from BrowsertestBase::Mixin.
-  virtual void SetUpCommandLine(base::CommandLine* command_line) override;
+  void SetUpCommandLine(base::CommandLine* command_line) override;
 
   // Runs screenshot testing if it is turned on by command line switches.
   void RunScreenshotTesting(const std::string& test_name);
 
   // Remembers that area |area| should be ignored during comparison.
   void IgnoreArea(const SkIRect& area);
 
  private:
   // It turns out that it takes some more time for the animation
   // to finish loading even after all the notifications have been sent.
@@ skipping 15 matching lines @@
   bool enable_test_screenshots_;
 
   // |screenshot_tester_ | does everything connected with taking, loading and
   // comparing screenshots
   ScreenshotTester screenshot_tester_;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENSHOT_TESTING_SCREENSHOT_TESTING_MIXIN_H_