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This CL adds aria-label for the two external link buttons in the sync
section in chrome://settings/syncSetup page.

Bug: 1066599
Change-Id: I95ff9149b9e1e3da0dbea25b067a26aa7af6fd0d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132452Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Commit-Queue: Monica Basta <msalama@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756006}