Use a check item instead of changing its text.

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!--
 This file contains definitions of resources that will be translated for each
 locale.  The variables is_win, is_macosx, is_linux, and is_posix are available
 for making strings OS specific.  Other platform defines such as use_titlecase
 are declared in build/common.gypi.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
@@ skipping 482 matching lines @@
         </message>
         <message name="IDS_CONTENT_CONTEXT_SPELLING_ASK_GOOGLE" desc="The context-menu item that asks whether to integrate the spelling service of Google to Chrome. This text is also used as the title of a bubble which confirms it.">
           Ask Google for suggestions
         </message>
         <message name="IDS_CONTENT_CONTEXT_SPELLING_BUBBLE_ENABLE" desc="The button text that allows integrating the spelling service of Google.">
           Enable
         </message>
         <message name="IDS_CONTENT_CONTEXT_SPELLING_BUBBLE_DISABLE" desc="The button text that disallows integrating the spelling service of Google.">
           No thanks
         </message>
-        <message name="IDS_CONTENT_CONTEXT_SPELLING_STOP_ASKING_GOOGLE" desc="The context-menu item that stops integrating the spelling service.">
-          Stop asking Google for suggestions
-        </message>
         <message name="IDS_CONTENT_CONTEXT_SPELLING_CHECKING" desc="The place-holder message shown while the Spelling service is checking text">
           Loading suggestion
         </message>
         <message name="IDS_CONTENT_CONTEXT_SPELLING_NO_SUGGESTIONS_FROM_GOOGLE" desc="The message shown when we cannot get any more suggestions from the Spelling service">
           No more suggestions from Google
         </message>
         <message name="IDS_CONTENT_CONTEXT_SPELLCHECK_MENU" desc="The name of the Spellcheck Options submenu in the content area context menu">
           &amp;Spell-checker options
         </message>
         <message name="IDS_CONTENT_CONTEXT_SELECTALL" desc="The name of the Select All command in the content area context menu">
@@ skipping 186 matching lines @@
         </message>
         <message name="IDS_CONTENT_CONTEXT_SPELLING_ASK_GOOGLE" desc="In Title Case: The context-menu item that asks whether to integrate the spelling service of Google to Chrome. This text is also used as the title of a bubble which confirms it.">
           Ask Google for Suggestions
         </message>
         <message name="IDS_CONTENT_CONTEXT_SPELLING_BUBBLE_ENABLE" desc="In Title Case: The button text that allows integrating the spelling service of Google.">
           Enable
         </message>
         <message name="IDS_CONTENT_CONTEXT_SPELLING_BUBBLE_DISABLE" desc="In Title Case: The button text that disallows integrating the spelling service of Google.">
           No Thanks
         </message>
-        <message name="IDS_CONTENT_CONTEXT_SPELLING_STOP_ASKING_GOOGLE" desc="The context-menu item that stops integrating the spelling service.">
-          Stop asking Google for suggestions
-        </message>
         <message name="IDS_CONTENT_CONTEXT_SPELLING_CHECKING" desc="The place-holder message shown while the Spelling service is checking text">
           Loading suggestion
         </message>
         <message name="IDS_CONTENT_CONTEXT_SPELLING_NO_SUGGESTIONS_FROM_GOOGLE" desc="The message shown when we cannot get any more suggestions from the Spelling service">
           No more suggestions from Google
         </message>
         <message name="IDS_CONTENT_CONTEXT_SPELLCHECK_MENU" desc="In Title Case: The name of the Spellcheck Options submenu in the content area context menu">
           &amp;Spell-checker Options
         </message>
         <message name="IDS_CONTENT_CONTEXT_LANGUAGE_SETTINGS" desc="In Title Case: The name of the Language Settings command in the content area context menu">
@@ skipping 14461 matching lines @@
     </messages>
     <structures fallback_to_english="true">
       <!-- Make sure these stay in sync with the structures in generated_resources.grd. -->
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
       <structure name="IDD_CHROME_FRAME_READY_PROMPT" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
   </release>
 </grit>