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With the change to DriveFS, drive paths no longer need to be special
cased, and can be treated as local paths.

Bug: 1003238
Change-Id: I6fb5851e08df7a967e328622b467aa9518d1f965
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832958Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Austin Tankiang <austinct@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703578}