Move ExtensionSystem into extensions namespace

chrome/browser/tab_contents/render_view_context_menu.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 <algorithm>
 #include <set>
 #include <utility>
 
 #include "chrome/browser/tab_contents/render_view_context_menu.h"
 
@@ skipping 619 matching lines @@
   if (!print_preview_menu_observer_.get()) {
     TabContents* tab_contents =
         TabContents::FromWebContents(source_web_contents_);
     print_preview_menu_observer_.reset(
         new PrintPreviewContextMenuObserver(tab_contents));
   }
   observers_.AddObserver(print_preview_menu_observer_.get());
 }
 
 const Extension* RenderViewContextMenu::GetExtension() const {
-  ExtensionSystem* system = ExtensionSystem::Get(profile_);
+  extensions::ExtensionSystem* system =
+      extensions::ExtensionSystem::Get(profile_);
   // There is no process manager in some tests.
   if (!system->process_manager())
     return NULL;
 
   return system->process_manager()->GetExtensionForRenderViewHost(
       source_web_contents_->GetRenderViewHost());
 }
 
 void RenderViewContextMenu::AppendPlatformAppItems() {
   const Extension* platform_app = GetExtension();
@@ skipping 1353 matching lines @@
   source_web_contents_->GetRenderViewHost()->
       ExecuteMediaPlayerActionAtLocation(location, action);
 }
 
 void RenderViewContextMenu::PluginActionAt(
     const gfx::Point& location,
     const WebPluginAction& action) {
   source_web_contents_->GetRenderViewHost()->
       ExecutePluginActionAtLocation(location, action);
 }