Update window title for login screen extension UI

Bug: 957573
Change-Id: I50e7a146cf2ba5a588fb28bfccaa0c3089bf5df4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1903361
Commit-Queue: Alexander Hendrich <hendrich@chromium.org>
Commit-Queue: Zakhar Voit <voit@google.com>
Auto-Submit: Alexander Hendrich <hendrich@chromium.org>
Reviewed-by: Zakhar Voit <voit@google.com>
Cr-Commit-Position: refs/heads/master@{#713439}

chrome/app/chromeos_strings.grdp

@@ -4103,7 +4103,7 @@ You can manage this account’s settings by installing the Family Link app on yo
 
   <!-- Strings for login screen extension UI -->
   <message name="IDS_LOGIN_EXTENSION_UI_DIALOG_TITLE" desc="Dialog title for windows opened from a login screen extension. These windows will be displayed over the login screen.">
-    This authentication service is hosted by <ph name="EXTENSION_NAME">$1<ex>Identity Provider Name</ex></ph>
+    Login provided by <ph name="EXTENSION_NAME">$1<ex>Identity Provider Name</ex></ph>
   </message>
 
   <!-- Strings for notifications about features which aren't supported in Crostini -->