[MD User Menu] New way to handle supervised user auth error

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 d14b7147d3258b8db0a9fe4e540e1b76e0bffaa9..513050cbddc4a8da266dcd2247090d0336056241 100644
--- a/chrome/app/chromium_strings.grd
+++ b/chrome/app/chromium_strings.grd
@@ -1137,6 +1137,9 @@ Please check your email at <ph name="ACCOUNT_EMAIL">$2<ex>jane.doe@example.com</
       </message>
 
       <!-- User menu errors -->
+      <message name="IDS_SYNC_ERROR_USER_MENU_SUPERVISED_SIGNIN_MESSAGE" desc="Message of the out-of-date signin token error for supervised users in the header of desktop user menu.">
+        Your manager must remove and add you back to Chromium.
+      </message>
       <message name="IDS_SYNC_ERROR_USER_MENU_UPGRADE_MESSAGE" desc="Message of the out-of-date Chrome client error in the header of desktop user menu."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         Chromium is out of date.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>