Standardize usage of virtual/override/final in chrome/

chrome/utility/extensions/extensions_handler.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 CHROME_UTILITY_EXTENSIONS_EXTENSIONS_HANDLER_H_
 #define CHROME_UTILITY_EXTENSIONS_EXTENSIONS_HANDLER_H_
 
 #include "base/base64.h"
 #include "base/compiler_specific.h"
 #include "base/json/json_reader.h"
 #include "base/macros.h"
 #include "chrome/common/media_galleries/picasa_types.h"
 #include "chrome/utility/utility_message_handler.h"
 
 #if !defined(ENABLE_EXTENSIONS)
 #error "Extensions must be enabled"
 #endif
 
 namespace metadata {
 class MediaMetadataParser;
 }
 
 namespace extensions {
 
 // Dispatches IPCs for Chrome extensions utility messages.
 class ExtensionsHandler : public UtilityMessageHandler {
  public:
   ExtensionsHandler();
-  virtual ~ExtensionsHandler();
+  ~ExtensionsHandler() override;
 
   static void PreSandboxStartup();
   static void UtilityThreadStarted();
 
   // IPC::Listener:
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
  private:
   // IPC message handlers.
   void OnUnpackExtension(const base::FilePath& extension_path,
                          const std::string& extension_id,
                          int location, int creation_flags);
   void OnUnzipToDir(const base::FilePath& zip_path, const base::FilePath& dir);
   void OnParseUpdateManifest(const std::string& xml);
   void OnDecodeImageBase64(const std::string& encoded_data);
   void OnParseJSON(const std::string& json);
@@ skipping 24 matching lines @@
 #if defined(OS_WIN)
   void OnGetWiFiCredentials(const std::string& network_guid);
 #endif  // defined(OS_WIN)
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionsHandler);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_UTILITY_EXTENSIONS_EXTENSIONS_HANDLER_H_