This adds a webui overlay on the extensions page for showing what Extension keybindings are active.…

chrome/browser/extensions/api/commands/extension_command_service_factory.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_API_COMMANDS_EXTENSION_COMMAND_SERVICE_FACTORY_H_
 #define CHROME_BROWSER_EXTENSIONS_API_COMMANDS_EXTENSION_COMMAND_SERVICE_FACTORY_H_
 #pragma once
 
 #include "base/memory/singleton.h"
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
 
+namespace extensions {
 class ExtensionCommandService;
+}
+
+namespace extensions {
 
 // Singleton that associate ExtensionCommandService objects with Profiles.
 class ExtensionCommandServiceFactory : public ProfileKeyedServiceFactory {
  public:
   static ExtensionCommandService* GetForProfile(Profile* profile);
 
   static ExtensionCommandServiceFactory* GetInstance();
 
   // Overridden from ProfileKeyedBaseFactory:
   virtual bool ServiceIsCreatedWithProfile() OVERRIDE;
 
  private:
   friend struct DefaultSingletonTraits<ExtensionCommandServiceFactory>;
 
   ExtensionCommandServiceFactory();
   virtual ~ExtensionCommandServiceFactory();
 
   // ProfileKeyedServiceFactory:
   virtual ProfileKeyedService* BuildServiceInstanceFor(
       Profile* profile) const OVERRIDE;
   virtual bool ServiceRedirectedInIncognito() OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionCommandServiceFactory);
 };
 
+}  // namespace extensions
+
 #endif  // CHROME_BROWSER_EXTENSIONS_API_COMMANDS_EXTENSION_COMMAND_SERVICE_FACTORY_H_