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

chrome/browser/extensions/webstore_install_helper.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 CHROME_BROWSER_EXTENSIONS_WEBSTORE_INSTALL_HELPER_H_
 #define CHROME_BROWSER_EXTENSIONS_WEBSTORE_INSTALL_HELPER_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 58 matching lines @@
   // specified, but it is legal for both to be empty.
   WebstoreInstallHelper(Delegate* delegate,
                         const std::string& id,
                         const std::string& manifest,
                         const std::string& icon_data,
                         const GURL& icon_url,
                         net::URLRequestContextGetter* context_getter);
   void Start();
 
  private:
-  virtual ~WebstoreInstallHelper();
+  ~WebstoreInstallHelper() override;
 
   void StartWorkOnIOThread();
   void StartFetchedImageDecode();
   void ReportResultsIfComplete();
   void ReportResultFromUIThread();
 
   // Implementing the net::URLFetcherDelegate interface.
-  virtual void OnURLFetchComplete(const net::URLFetcher* source) override;
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
 
   // Implementing pieces of the UtilityProcessHostClient interface.
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
   // Message handlers.
   void OnDecodeImageSucceeded(const SkBitmap& decoded_image);
   void OnDecodeImageFailed();
   void OnJSONParseSucceeded(const base::ListValue& wrapper);
   void OnJSONParseFailed(const std::string& error_message);
 
   // The client who we'll report results back to.
   Delegate* delegate_;
 
@@ skipping 29 matching lines @@
   std::string error_;
 
   // A code to distinguish between an error with the icon, and an error with the
   // manifest.
   Delegate::InstallHelperResultCode parse_error_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_WEBSTORE_INSTALL_HELPER_H_