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 eadfe624fa16f68e30fc916b04f787f9d655c018..d5f743c9bfa111645bce299d587997a5710b67ea 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message name="IDS_SYNC_ERROR_USER_MENU_UPGRADE_MESSAGE" desc="Message of the out-of-date Chrome client error in the header of desktop user menu."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+        Chromium is out of date.

[msw, 2016/07/13 22:31:37]

It's unfortunate that we are adding a fourth "Chromium is out of date" string
and a second "Update Chromium" string; it'd be nice if they were shared.

[Jane, 2016/07/14 00:18:57]

I noticed that too, but it seemed that different UI components keep a different
set of the strings. Let me know if you think it's better to just use the upgrade
recovery bubble strings for the user menu.

[msw, 2016/07/14 02:23:33]

No, if anything, we'd want to consolidate them to IDS_OUT_OF_DATE and IDS_UPDATE
or similar, and that's outside the scope of this CL; this is fine for now, I
just like to complain sometimes.

+      </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desc="Button in the header of desktop user menu that prompts the user to update Chrome to fix the out-of-date Chrome client error."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