Move Extension into extensions namespace

chrome/browser/extensions/extension_keybinding_registry.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_EXTENSION_KEYBINDING_REGISTRY_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_KEYBINDING_REGISTRY_H_
 #pragma once
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_source.h"
 
-class Extension;
 class Profile;
 
 namespace extensions {
 
+class Extension;
+
 // The ExtensionKeybindingRegistry is a class that handles the cross-platform
 // logic for keyboard accelerators. See platform-specific implementations for
 // implementation details for each platform.
 class ExtensionKeybindingRegistry : public content::NotificationObserver {
  public:
   explicit ExtensionKeybindingRegistry(Profile* profile);
   virtual ~ExtensionKeybindingRegistry();
 
   // Overridden from content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
  protected:
   // Add extension keybinding for the events defined by the |extension|.
-  virtual void AddExtensionKeybinding(const Extension* extension) = 0;
+  virtual void AddExtensionKeybinding(
+      const Extension* extension) = 0;
   // Remove extension bindings for |extension|.
-  virtual void RemoveExtensionKeybinding(const Extension* extension) = 0;
+  virtual void RemoveExtensionKeybinding(
+      const Extension* extension) = 0;
 
   // Make sure all extensions registered have keybindings added.
   void Init();
 
   // Whether to ignore this command. Only browserAction commands and pageAction
   // commands are currently ignored, since they are handled elsewhere.
   bool ShouldIgnoreCommand(const std::string& command) const;
 
  private:
   // The content notification registrar for listening to extension events.
   content::NotificationRegistrar registrar_;
 
   // Weak pointer to the our profile. Not owned by us.
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionKeybindingRegistry);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_KEYBINDING_REGISTRY_H_