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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: I2bf7f3d587ab856f493802a27a7f6f8333551f94
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1800139Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Commit-Queue: Austin Tankiang <austinct@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697071}