Revamped signin/sync error surfacing on desktop user menu

chrome/app/google_chrome_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <!-- This file contains definitions of strings that are specific to
 Google Chrome. These strings will be translated for each locale that Google
 Chrome supports. If you update this file, be sure also to update
 chromium_strings.grd. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/google_chrome_strings.h" type="rc_header">
@@ skipping 1093 matching lines @@
       <message name="IDS_UPGRADE_BUBBLE_TITLE" desc="Text for the title of the upgrade bubble view.">
         Chrome is out of date
       </message>
       <message name="IDS_UPGRADE_BUBBLE_TEXT" desc="Text for the upgrade bubble view full description.">
         Chrome could not update itself to the latest version, so you are missing out on awesome new features and security fixes. You need to manually reinstall Chrome.
       </message>
       <message name="IDS_UPGRADE_BUBBLE_REENABLE_TEXT" desc="Text for the upgrade bubble view full description.">
         Chrome could not update itself to the latest version, so you are missing out on awesome new features and security fixes. You need to update Chrome.
       </message>
 
+      <!-- User menu errors -->
+      <message name="IDS_SYNC_ERROR_USER_MENU_UPGRADE_MESSAGE" desc="Message of the out-of-date Chrome client error in the header of desktop user menu.">
+        Chrome is out of date.
+      </message>
+      <message name="IDS_SYNC_ERROR_USER_MENU_UPGRADE_BUTTON" desc="Button in the header of desktop user menu that prompts the user to update Chrome to fix the out-of-date Chrome client error.">
+        Update Chrome
+      </message>
+
       <!-- Upgrade recovery bubble -->
       <message name="IDS_RUN_RECOVERY" desc="Text for the button the user clicks to recover Chrome and its updater.">
         Update Chrome
       </message>
       <message name="IDS_DECLINE_RECOVERY" desc="Text for the button the user clicks to decline recovery request.">
         No, thanks
       </message>
       <message name="IDS_RECOVERY_BUBBLE_TITLE" desc="Text for the title of the chrome recovery bubble view.">
         Chrome is out of date
       </message>
@@ skipping 94 matching lines @@
         </message>
         <message name="IDS_METRO_FLOW_LOGO_STRING_ALT"
                  desc="Alt text for the faded Chrome logo image.">
           Chrome logo
         </message>
       </if>
 
     </messages>
   </release>
 </grit>