[Extensions] Polish the suspicious extension bubble

chrome/app/chromium_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <!-- This file contains definitions of strings that are distribution specific.
 These strings will not be translated and only english versions will
 be available for now. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/chromium_strings.h" type="rc_header">
       <emit emit_type='prepend'></emit>
@@ skipping 766 matching lines @@
 
       <!-- chrome://settings/extensions page -->
       <message name="IDS_EXTENSIONS_INCOGNITO_WARNING" desc="Warns the user that Chromium cannot prevent extensions from recording history in incognito mode. Displayed in extensions management UI after an extension is selected to be run in incognito mode.">
         <ph name="BEGIN_BOLD">&lt;b&gt;</ph>Warning:<ph name="END_BOLD">&lt;/b&gt;</ph> Chromium cannot prevent extensions from recording your browsing history. To disable this extension in incognito mode, unselect this option.
       </message>
       <message name="IDS_EXTENSIONS_UNINSTALL" desc="The link for uninstalling extensions.">
         Remove from Chromium...
       </message>
 
       <if expr="enable_extensions">
-        <message name="IDS_EXTENSIONS_UNSUPPORTED_DISABLED_BODY" desc="Body of the dialog shown when unsupported extensions have been disabled">
+        <message name="IDS_EXTENSIONS_MULTIPLE_UNSUPPORTED_DISABLED_BODY" desc="Body of the dialog shown when multiple unsupported extensions have been disabled.">
           To make Chromium safer, we disabled some extensions that aren't listed in the <ph name="IDS_EXTENSION_WEB_STORE_TITLE">$1<ex>Chrome Web Store</ex></ph> and may have been added without your knowledge.
         </message>
+        <message name="IDS_EXTENSIONS_SINGLE_UNSUPPORTED_DISABLED_BODY" desc="Body of the dialog shown when a single unsupported extension has been disabled.">
+          To make Chromium safer, we disabled the following extension that isn't listed in the <ph name="IDS_EXTENSION_WEB_STORE_TITLE">$1<ex>Chrome Web Store</ex></ph> and may have been added without your knowledge.
+        </message>
       </if>
 
       <!-- Main Chrome menu -->
       <message name="IDS_APPMENU_TOOLTIP" desc="The tooltip to show for the browser menu">
         Customize and control Chromium
       </message>
 
       <if expr="use_titlecase and not chromeos">
         <message name="IDS_ABOUT" desc="In Title Case: The text label of the About Chrome menu item">
           About &amp;Chromium
@@ skipping 543 matching lines @@
           Chromium updates automatically so you always have the freshest version. When this download completes, Chromium will restart and you'll be on your way.
         </message>
         <message name="IDS_EULA_SCREEN_ACCESSIBLE_TITLE" desc="Title to be spoken on opening the OOBE EULA screen">
           Chromium OS terms
         </message>
       </if>
 
     </messages>
   </release>
 </grit>