Rewrite SyncErrorNotifierTest in terms of TestSyncService

...instead of ProfileSyncServiceMock, which is an antipattern.

While we're here, also generally clean up a bit: Remove unused includes
etc.

Bug: 910518
Change-Id: Id3da7f7ceeb6b9c2495b96d30ac7591a75270310
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1522995
Auto-Submit: Marc Treib <treib@chromium.org>
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#640737}
1 file changed