Move ExtensionSystem into extensions namespace

chrome/browser/extensions/extension_host.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_host.h"
 
 #include <list>
 
 #include "base/bind.h"
 #include "base/memory/singleton.h"
@@ skipping 42 matching lines @@
 #include "ui/base/layout.h"
 #include "ui/base/resource/resource_bundle.h"
 
 using WebKit::WebDragOperation;
 using WebKit::WebDragOperationsMask;
 using content::NativeWebKeyboardEvent;
 using content::OpenURLParams;
 using content::RenderViewHost;
 using content::SiteInstance;
 using content::WebContents;
+using extensions::ExtensionSystem;
 
 // Helper class that rate-limits the creation of renderer processes for
 // ExtensionHosts, to avoid blocking the UI.
 class ExtensionHost::ProcessCreationQueue {
  public:
   static ProcessCreationQueue* GetInstance() {
     return Singleton<ProcessCreationQueue>::get();
   }
 
   // Add a host to the queue for RenderView creation.
@@ skipping 538 matching lines @@
   params.user_gesture = user_gesture;
   chrome::Navigate(&params);
 }
 
 void ExtensionHost::RenderViewReady() {
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_EXTENSION_HOST_CREATED,
       content::Source<Profile>(profile_),
       content::Details<ExtensionHost>(this));
 }