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This CL changes help context string introduced by
https://crrev.com/c/1299133 for "?" button in "Sync and Google services"
settings page.

Bug: 885333
Change-Id: Ibe24f7f85ad4080dea0eae55efeb7810cb026430
Reviewed-on: https://chromium-review.googlesource.com/c/1304555Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603523}