Update {virtual,override,final} for ui/views_content_client to follow C++11 style.

ui/views_content_client/views_content_client_main_parts_mac.mm

 // 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.
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/files/file_path.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/path_service.h"
 #include "content/public/browser/plugin_service.h"
@@ skipping 16 matching lines @@
 
 namespace ui {
 
 namespace {
 
 class ViewsContentClientMainPartsMac : public ViewsContentClientMainParts {
  public:
   ViewsContentClientMainPartsMac(
       const content::MainFunctionParams& content_params,
       ViewsContentClient* views_content_client);
-  virtual ~ViewsContentClientMainPartsMac();
+  ~ViewsContentClientMainPartsMac() override;
 
   // content::BrowserMainParts:
-  virtual void PreMainMessageLoopRun() override;
+  void PreMainMessageLoopRun() override;
 
  private:
   base::scoped_nsobject<ViewsContentClientAppController> app_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(ViewsContentClientMainPartsMac);
 };
 
 ViewsContentClientMainPartsMac::ViewsContentClientMainPartsMac(
     const content::MainFunctionParams& content_params,
     ViewsContentClient* views_content_client)
@@ skipping 63 matching lines @@
   NSString* quitTitle = [@"Quit " stringByAppendingString:appName];
   [appMenu addItemWithTitle:quitTitle
                      action:@selector(terminate:)
               keyEquivalent:@"q"];
   [appMenuItem setSubmenu:appMenu];
 
   task_.Run();
 }
 
 @end