Move fake GetUserSettings() impl from SyncService to [Fake|Test]SyncService

Bug: 884159
Change-Id: Idb63eef4c7e6786ac589fc39bd637478c8b7ff8b
Reviewed-on: https://chromium-review.googlesource.com/c/1333370
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607618}
6 files changed