[SendTabToSelf] remove expired sync entries after 10 days.

Bug: 910390
Change-Id: Iad49c4b2d7d45374e1959006fb1f88bd34322fd0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1474791
Commit-Queue: Jeffrey Cohen <jeffreycohen@chromium.org>
Reviewed-by: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#642050}
7 files changed