Standardize usage of virtual/override/final in extensions/

extensions/browser/extension_web_contents_observer.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_BROWSER_EXTENSION_WEB_CONTENTS_OBSERVER_H_
 #define EXTENSIONS_BROWSER_EXTENSION_WEB_CONTENTS_OBSERVER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 13 matching lines @@
 // renderer access to certain URL scheme patterns for extensions and notifies
 // the renderer that the extension was loaded.
 //
 // Extension system embedders must create an instance for every extension
 // WebContents. It must be a subclass so that creating an instance via
 // content::WebContentsUserData::CreateForWebContents() provides an object of
 // the correct type. For an example, see ChromeExtensionWebContentsObserver.
 class ExtensionWebContentsObserver : public content::WebContentsObserver {
  protected:
   explicit ExtensionWebContentsObserver(content::WebContents* web_contents);
-  virtual ~ExtensionWebContentsObserver();
+  ~ExtensionWebContentsObserver() override;
 
   content::BrowserContext* browser_context() { return browser_context_; }
 
   // content::WebContentsObserver overrides.
 
   // A subclass should invoke this method to finish extension process setup.
-  virtual void RenderViewCreated(content::RenderViewHost* render_view_host)
-      override;
+  void RenderViewCreated(content::RenderViewHost* render_view_host) override;
 
   // Returns the extension or app associated with a render view host. Returns
   // NULL if the render view host is not for a valid extension.
   const Extension* GetExtension(content::RenderViewHost* render_view_host);
 
   // Updates ViewType for RenderViewHost based on GetViewType(web_contents()).
   void NotifyRenderViewType(content::RenderViewHost* render_view_host);
 
   // Returns the extension or app ID associated with a render view host. Returns
   // the empty string if the render view host is not for a valid extension.
   static std::string GetExtensionId(content::RenderViewHost* render_view_host);
 
  private:
   // The BrowserContext associated with the WebContents being observed.
   content::BrowserContext* browser_context_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionWebContentsObserver);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_WEB_CONTENTS_OBSERVER_H_