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

chrome/browser/ui/webui/extensions/install_extension_handler.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_UI_WEBUI_EXTENSIONS_INSTALL_EXTENSION_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_EXTENSIONS_INSTALL_EXTENSION_HANDLER_H_
 
 #include "base/files/file_path.h"
 #include "base/strings/string16.h"
 #include "base/values.h"
 #include "content/public/browser/web_ui_message_handler.h"
 
 namespace content {
 class WebUIDataSource;
 }
 
 namespace extensions {
 
 // Handles installing an extension when its file is dragged onto the page.
 class InstallExtensionHandler : public content::WebUIMessageHandler {
  public:
   InstallExtensionHandler();
-  virtual ~InstallExtensionHandler();
+  ~InstallExtensionHandler() override;
 
   void GetLocalizedValues(content::WebUIDataSource* source);
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages() override;
+  void RegisterMessages() override;
 
  private:
   // Handles a notification from the JavaScript that a drag has started. This is
   // needed so that we can capture the file being dragged. If we wait until
   // we receive a drop notification, the drop data in the browser process will
   // have already been destroyed.
   void HandleStartDragMessage(const base::ListValue* args);
 
   // Handles a notification from the JavaScript that a drag has stopped.
   void HandleStopDragMessage(const base::ListValue* args);
@@ skipping 14 matching lines @@
   // called.
   base::FilePath file_to_install_;
   base::string16 file_display_name_;
 
   DISALLOW_COPY_AND_ASSIGN(InstallExtensionHandler);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_UI_WEBUI_EXTENSIONS_INSTALL_EXTENSION_HANDLER_H_