Standardize usage of virtual/override/final in chrome/browser/ui/

chrome/browser/ui/cocoa/screen_capture_notification_ui_cocoa.h

 // Copyright 2013 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.
 
 #import <Cocoa/Cocoa.h>
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/gtest_prod_util.h"
@@ skipping 14 matching lines @@
 - (id)initWithCallback:(const base::Closure&)stop_callback
                   text:(const base::string16&)text;
 - (void)stopSharing:(id)sender;
 - (void)minimize:(id)sender;
 
 @end
 
 class ScreenCaptureNotificationUICocoa : public ScreenCaptureNotificationUI {
  public:
   explicit ScreenCaptureNotificationUICocoa(const base::string16& text);
-  virtual ~ScreenCaptureNotificationUICocoa();
+  ~ScreenCaptureNotificationUICocoa() override;
 
   // ScreenCaptureNotificationUI interface.
-  virtual gfx::NativeViewId OnStarted(const base::Closure& stop_callback)
-      override;
+  gfx::NativeViewId OnStarted(const base::Closure& stop_callback) override;
 
  private:
   friend class ScreenCaptureNotificationUICocoaTest;
 
   const base::string16 text_;
   base::scoped_nsobject<ScreenCaptureNotificationController> windowController_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenCaptureNotificationUICocoa);
 };