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I was mostly looking for components/signin/-related things, but
discovered a bunch more stuff along the way, mostly in
ProfileSyncComponentsFactoryImpl.

Bug: 825190
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I1b17d00db3cbefa50a7fabaf0b3e55e7ea567610
Reviewed-on: https://chromium-review.googlesource.com/978211Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545747}