Move a bunch of code in content\renderer to the content namespace.

content/renderer/external_popup_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 CONTENT_RENDERER_EXTERNAL_POPUP_MENU_H_
 #define CONTENT_RENDERER_EXTERNAL_POPUP_MENU_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebExternalPopupMenu.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebPopupMenuInfo.h"
 
-class RenderViewImpl;
 namespace WebKit {
 class WebExternalPopupMenuClient;
 }
 
+namespace content {
+class RenderViewImpl;
+
 class ExternalPopupMenu : public WebKit::WebExternalPopupMenu {
  public:
   ExternalPopupMenu(RenderViewImpl* render_view,
                     const WebKit::WebPopupMenuInfo& popup_menu_info,
                     WebKit::WebExternalPopupMenuClient* popup_menu_client);
 
   virtual ~ExternalPopupMenu() {}
 
 #if defined(OS_MACOSX)
   // Called when the user has selected an item. |selected_item| is -1 if the
@@ skipping 11 matching lines @@
   virtual void close();
 
  private:
   RenderViewImpl* render_view_;
   WebKit::WebPopupMenuInfo popup_menu_info_;
   WebKit::WebExternalPopupMenuClient* popup_menu_client_;
 
   DISALLOW_COPY_AND_ASSIGN(ExternalPopupMenu);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_RENDERER_EXTERNAL_POPUP_MENU_H_