Move Extension into extensions namespace

chrome/browser/ui/cocoa/extensions/extension_action_context_menu.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_COCOA_EXTENSIONS_EXTENSION_ACTION_CONTEXT_MENU_H_
 #define CHROME_BROWSER_UI_COCOA_EXTENSIONS_EXTENSION_ACTION_CONTEXT_MENU_H_
 #pragma once
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/memory/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
 
 class AsyncUninstaller;
-class Extension;
 class ExtensionAction;
 class Profile;
 
+namespace extensions {
+class Extension;
+}
+
 namespace extension_action_context_menu {
 
 }  // namespace extension_action_context_menu
 
 // A context menu used by any extension UI components that require it.
 @interface ExtensionActionContextMenu : NSMenu {
  @private
   // The extension that this menu belongs to. Weak.
-  const Extension* extension_;
+  const extensions::Extension* extension_;
 
   // The extension action this menu belongs to. Weak.
   ExtensionAction* action_;
 
   // The browser profile of the window that contains this extension. Weak.
   Profile* profile_;
 
   // Used to load the extension icon asynchronously on the I/O thread then show
   // the uninstall confirmation dialog.
   scoped_ptr<AsyncUninstaller> uninstaller_;
 }
 
 // Initializes and returns a context menu for the given extension and profile.
-- (id)initWithExtension:(const Extension*)extension
+- (id)initWithExtension:(const extensions::Extension*)extension
                 profile:(Profile*)profile
         extensionAction:(ExtensionAction*)action;
 
 @end
 
 typedef ExtensionActionContextMenu ExtensionActionContextMenuMac;
 
 #endif  // CHROME_BROWSER_UI_COCOA_EXTENSIONS_EXTENSION_ACTION_CONTEXT_MENU_H_