Update {virtual,override} to follow C++11 style in content.

content/browser/plugin_service_impl.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.
 
 // This class responds to requests from renderers for the list of plugins, and
 // also a proxy object for plugin instances.
 
 #ifndef CONTENT_BROWSER_PLUGIN_SERVICE_IMPL_H_
 #define CONTENT_BROWSER_PLUGIN_SERVICE_IMPL_H_
 
@@ skipping 93 matching lines @@
   void RegisterInternalPlugin(const WebPluginInfo& info,
                               bool add_at_beginning) override;
   void UnregisterInternalPlugin(const base::FilePath& path) override;
   void GetInternalPlugins(std::vector<WebPluginInfo>* plugins) override;
   bool NPAPIPluginsSupported() override;
   void EnableNpapiPlugins() override;
   void DisablePluginsDiscoveryForTesting() override;
 #if defined(OS_MACOSX)
   void AppActivated() override;
 #elif defined(OS_WIN)
-  virtual bool GetPluginInfoFromWindow(HWND window,
-                                       base::string16* plugin_name,
-                                       base::string16* plugin_version) override;
+  bool GetPluginInfoFromWindow(HWND window,
+                               base::string16* plugin_name,
+                               base::string16* plugin_version) override;
 
   // Returns true iff the given HWND is a plugin.
   bool IsPluginWindow(HWND window);
 #endif
   bool PpapiDevChannelSupported(BrowserContext* browser_context,
                                 const GURL& document_url) override;
 
   // Returns the plugin process host corresponding to the plugin process that
   // has been started by this service. This will start a process to host the
   // 'plugin_path' if needed. If the process fails to start, the return value
@@ skipping 122 matching lines @@
 
   // Used to detect if a given plugin is crashing over and over.
   std::map<base::FilePath, std::vector<base::Time> > crash_times_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginServiceImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_PLUGIN_SERVICE_IMPL_H_