Migrate Sync integration tests to SyncUserSettings

Bug: 884159
Change-Id: Ibcb7f843551c3e052610d3847b2537ee27a575fb
Reviewed-on: https://chromium-review.googlesource.com/c/1339960
Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608736}
9 files changed