Use a check item instead of changing its text.

chrome/browser/tab_contents/spelling_menu_observer.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 CHROME_BROWSER_TAB_CONTENTS_SPELLING_MENU_OBSERVER_H_
 #define CHROME_BROWSER_TAB_CONTENTS_SPELLING_MENU_OBSERVER_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 27 matching lines @@
 //   }
 //
 class SpellingMenuObserver : public RenderViewContextMenuObserver {
  public:
   explicit SpellingMenuObserver(RenderViewContextMenuProxy* proxy);
   virtual ~SpellingMenuObserver();
 
   // RenderViewContextMenuObserver implementation.
   virtual void InitMenu(const content::ContextMenuParams& params) OVERRIDE;
   virtual bool IsCommandIdSupported(int command_id) OVERRIDE;
+  virtual bool IsCommandIdChecked(int command_id) OVERRIDE;
   virtual bool IsCommandIdEnabled(int command_id) OVERRIDE;
   virtual void ExecuteCommand(int command_id) OVERRIDE;
 
   // A callback function called when the Spelling service finishes checking a
   // misspelled word.
   void OnTextCheckComplete(
       int tag,
       const std::vector<SpellCheckResult>& results);
 
  private:
@@ skipping 42 matching lines @@
 
   // Flag indicating whether online spelling correction service is enabled. When
   // this variable is true and we right-click a misspelled word, we send a
   // JSON-RPC request to the service and retrieve suggestions.
   bool integrate_spelling_service_;
 
   DISALLOW_COPY_AND_ASSIGN(SpellingMenuObserver);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_SPELLING_MENU_OBSERVER_H_