Standardize usage of virtual/override/final specifiers.

extensions/shell/app/shell_main_delegate.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 EXTENSIONS_SHELL_APP_SHELL_MAIN_DELEGATE_H_
 #define EXTENSIONS_SHELL_APP_SHELL_MAIN_DELEGATE_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/app/content_main_delegate.h"
 
 namespace content {
 class BrowserContext;
 class ContentBrowserClient;
 class ContentClient;
 class ContentRendererClient;
 }
 
 namespace extensions {
 class ShellBrowserMainDelegate;
 
 class ShellMainDelegate : public content::ContentMainDelegate {
  public:
   ShellMainDelegate();
-  virtual ~ShellMainDelegate();
+  ~ShellMainDelegate() override;
 
   // ContentMainDelegate implementation:
-  virtual bool BasicStartupComplete(int* exit_code) override;
-  virtual void PreSandboxStartup() override;
-  virtual content::ContentBrowserClient* CreateContentBrowserClient() override;
-  virtual content::ContentRendererClient* CreateContentRendererClient()
-      override;
+  bool BasicStartupComplete(int* exit_code) override;
+  void PreSandboxStartup() override;
+  content::ContentBrowserClient* CreateContentBrowserClient() override;
+  content::ContentRendererClient* CreateContentRendererClient() override;
 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
-  virtual void ZygoteStarting(
+  void ZygoteStarting(
       ScopedVector<content::ZygoteForkDelegate>* delegates) override;
 #endif
 
  protected:
   // The created object is owned by this object.
   virtual content::ContentClient* CreateContentClient();
   virtual content::ContentBrowserClient* CreateShellContentBrowserClient();
   virtual content::ContentRendererClient* CreateShellContentRendererClient();
 
   // Initializes the resource bundle and resources.pak.
   virtual void InitializeResourceBundle();
 
  private:
   // |process_type| is zygote, renderer, utility, etc. Returns true if the
   // process needs data from resources.pak.
   static bool ProcessNeedsResourceBundle(const std::string& process_type);
 
   scoped_ptr<content::ContentClient> content_client_;
   scoped_ptr<content::ContentBrowserClient> browser_client_;
   scoped_ptr<content::ContentRendererClient> renderer_client_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellMainDelegate);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_SHELL_APP_SHELL_MAIN_DELEGATE_H_