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This logically reverts the old https://codereview.chromium.org/551843003
because meanwhile the Sync Directory has been deprecated in favor of a
new codepath, Unified Sync and Storage (USS).

Change-Id: I80e66c304b76a8d9edffe1a4657ba0c2513f2ff4
Bug: 923287
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2250042Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779748}