Use a check item instead of changing its text.

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 661 matching lines @@
 void RenderViewContextMenu::LookUpInDictionary() {
   // Used only in the Mac port.
   NOTREACHED();
 }
 
 void RenderViewContextMenu::AddMenuItem(int command_id,
                                         const string16& title) {
   menu_model_.AddItem(command_id, title);
 }
 
+void RenderViewContextMenu::AddCheckItem(int command_id,
+                                         const string16& title) {
+  menu_model_.AddCheckItem(command_id, title);
+}
+
 void RenderViewContextMenu::AddSeparator() {
   menu_model_.AddSeparator();
 }
 
 void RenderViewContextMenu::AddSubMenu(int command_id,
                                        const string16& label,
                                        ui::MenuModel* model) {
   menu_model_.AddSubMenu(command_id, label, model);
 }
 
@@ skipping 1298 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);
 }