Revamped signin/sync error surfacing on desktop user menu

chrome/app/chromium_strings.grd

Index: chrome/app/chromium_strings.grd
diff --git a/chrome/app/chromium_strings.grd b/chrome/app/chromium_strings.grd
index 71c53f772338492d581ef0e83c9adad560d988a9..0d5353d262d66d4d47ff2c65749134b294939fc2 100644
--- a/chrome/app/chromium_strings.grd
+++ b/chrome/app/chromium_strings.grd
@@ -1110,6 +1110,14 @@ Please check your email at <ph name="ACCOUNT_EMAIL">$2<ex>jane.doe@example.com</
         Chromium could not update itself to the latest version, so you are missing out on awesome new features and security fixes. You need to update Chromium.
       </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message name="IDS_SYNC_ERROR_USER_MENU_UPGRADE_MESSAGE" desc="Message of the out-of-date Chrome client error in the header of desktop user menu.">
+        Chromium is out of date.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desc="Button in the header of desktop user menu that prompts the user to update Chrome to fix the out-of-date Chrome client error."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 Chromium
+      </message>
+
       <!-- Upgrade recovery bubble -->
       <message name="IDS_RUN_RECOVERY" desc="Text for the button the user clicks to recover chromium and its updater.">
         Update Chromium