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This deprecated method was already implemented in terms of the new
GetDisableReasons. This CL moves the remaining callers over to use
GetDisableReasons directly, and removes IsSyncAllowed.

Bug: 839834
Change-Id: I41d1a59aff323f0752431a281a432118d437df44
Reviewed-on: https://chromium-review.googlesource.com/1138250
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577546}