commit f9b83be733ccf22f0c68b87b705d716f5ed9506d
author Mohamed Amir Yosef <mamir@chromium.org> Wed Mar 20 13:34:32 2019
committer Commit Bot <commit-bot@chromium.org> Wed Mar 20 13:34:32 2019
tree 9fd64c7658ff83cce3854c8cd1c1faf6a050978a
parent dd0f551fcd96d46c6ec2b2a7c543cb2083f1831d

[Sync] Fix Syncing Cleared Preferences bug

Before this CL:
Upon clearing a pref on the client, sync would push the default of the
pref to the server and other clients.
This is wrong because other clients cannot tell if the user has
actually cleared the pref or intentionally set it to the default value.

After this CL:
Upon clearing a pref on the client, sync would remove the pref from
the server and other clients.

Bug: 943579
Change-Id: Iffe7f7869c8a5a40d1ff410bcb08d6df77e3dc52
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1530906
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#642488}