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syncer::TestSyncService already supports most of the state that's
required here, so this lets us remove a bunch of boilerplate.

Bug: 859874
Change-Id: I3c45e341f31c199176dd8173b6a858a8c704c15f
Reviewed-on: https://chromium-review.googlesource.com/c/1335582
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608506}