GitLab

1) Remove sync_thread_ from the ProfileSyncService interface to avoid
accidental use.
2) Enable experiment in tests to provide coverage.
3) Add some ScopedAllowBaseSyncPrimitives in code that needed it.

Bug: 1014464
Change-Id: I79393edac048a2960b4f2bc7593be326f5d27419
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895797
Commit-Queue: Oliver Li <olivierli@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Auto-Submit: Oliver Li <olivierli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713459}