Reland "[Sync] Deprecate BookmarkData in SyncEntity and remove related code"

This is a reland of 4a0cf6516ff4f2a8249f479979b8f284c1eab1ee

Original change's description:
> [Sync] Deprecate BookmarkData in SyncEntity and remove related code
> 
> Bug: 860643
> Change-Id: Ic472b0d4a182cb70fce2a035197897cdb9e609c2
> Reviewed-on: https://chromium-review.googlesource.com/1127791
> Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
> Reviewed-by: Mikel Astiz <mastiz@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#575221}

Bug: 860643
Change-Id: I61fc398f00e53f7b4c51f85e82da897cd5f91d9d
Reviewed-on: https://chromium-review.googlesource.com/1141626
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576005}
9 files changed