Move Extension 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 84 matching lines @@
 using content::ChildProcessSecurityPolicy;
 using content::DownloadManager;
 using content::DownloadUrlParameters;
 using content::NavigationController;
 using content::NavigationEntry;
 using content::OpenURLParams;
 using content::RenderViewHost;
 using content::SSLStatus;
 using content::UserMetricsAction;
 using content::WebContents;
+using extensions::Extension;
 
 namespace {
 
 // Usually a new tab is expected where this function is used,
 // however users should be able to open a tab in background
 // or in a new window.
 WindowOpenDisposition ForceNewTabDispositionFromEventFlags(
     int event_flags) {
   WindowOpenDisposition disposition =
       browser::DispositionFromEventFlags(event_flags);
@@ skipping 1868 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);
 }