GitLab

The legacy drive sync client is being deleted in favour of switching to
DriveFS, so remove the feature flag and clean up code using the flag.

Bug: 1002339
Change-Id: I51035d863569d484748a22dd6b07b5aaf26a7057
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1797943
Commit-Queue: Austin Tankiang <austinct@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697086}