Revamped signin/sync error surfacing on desktop user menu

chrome/app/google_chrome_strings.grd

Index: chrome/app/google_chrome_strings.grd
diff --git a/chrome/app/google_chrome_strings.grd b/chrome/app/google_chrome_strings.grd
index a21bfaa6e58c7096267d5cf839f694015b237bbf..15220ec6a6ecff6cd5d93bd110e9ee9f71b23801 100644
--- a/chrome/app/google_chrome_strings.grd
+++ b/chrome/app/google_chrome_strings.grd
@@ -1111,6 +1111,14 @@ Please check your email at <ph name="ACCOUNT_EMAIL">$2<ex>jane.doe@example.com</
         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message name="IDS_SYNC_ERROR_USER_MENU_UPGRADE_MESSAGE" desc="Message of the out-of-date Chrome client error in the header of desktop user menu."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+        Chrome is out of date.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desc="Button in the header of desktop user menu that prompts the user to update Chrome to fix the out-of-date Chrome client error."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