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Previously, all user events were deleted when Sync was disabled. After
this CL, user consent events are preserved in persistent store. This CL
does *not* include their garbage collection and attempting to send them again.


Bug: 781765
Change-Id: I6fdb7488da81324d782f28745299301b551a712c
Reviewed-on: https://chromium-review.googlesource.com/986514
Commit-Queue: vitaliii <vitaliii@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548767}