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DriveFS is going to be used regardless of its feature flag, and the
legacy drive sync client will be deleted, so clean up code that relies
on the legacy drive sync client.

Bug: 1002339
Change-Id: Iba820095870d8aad1ba92b747af0849b750a150d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1798257Reviewed-by: Pavol Marko <pmarko@chromium.org>
Commit-Queue: Austin Tankiang <austinct@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697037}