Standardize usage of virtual/override/final specifiers.

ash/shell/content_client/shell_main_delegate.h

 // Copyright (c) 2012 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 ASH_SHELL_CONTENT_CLIENT_SHELL_MAIN_DELEGATE_H_
 #define ASH_SHELL_CONTENT_CLIENT_SHELL_MAIN_DELEGATE_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/app/content_main_delegate.h"
 #include "content/shell/common/shell_content_client.h"
 
 namespace content {
 class ShellContentRendererClient;
 class ShellContentPluginClient;
 class ShellContentUtilityClient;
 }
 
 namespace ash {
 namespace shell {
 
 class ShellContentBrowserClient;
 
 class ShellMainDelegate : public content::ContentMainDelegate {
  public:
   ShellMainDelegate();
-  virtual ~ShellMainDelegate();
+  ~ShellMainDelegate() override;
 
-  virtual bool BasicStartupComplete(int* exit_code) override;
-  virtual void PreSandboxStartup() override;
-  virtual content::ContentBrowserClient* CreateContentBrowserClient() override;
+  bool BasicStartupComplete(int* exit_code) override;
+  void PreSandboxStartup() override;
+  content::ContentBrowserClient* CreateContentBrowserClient() override;
 
  private:
   void InitializeResourceBundle();
 
   scoped_ptr<ShellContentBrowserClient> browser_client_;
   content::ShellContentClient content_client_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellMainDelegate);
 };
 
 }  // namespace shell
 }  // namespace ash
 
 #endif  // ASH_SHELL_CONTENT_CLIENT_SHELL_MAIN_DELEGATE_H_