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Send Tab To Self shares a url with a specific syncing machine, in order
to determine if the shared tab is meant for the local device, there needs
to be some persistence in storing previously used cache guids locally.

So that a local machine will not "miss" a tab sent to its previous guid.

Bug: 981850
Change-Id: Ibe99baae9d336a4e737935f4e7ce874496e604a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1694147
Commit-Queue: Jeffrey Cohen <jeffreycohen@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680215}