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For ARCVM, DriveFS path will be handled by Seneschal SharePath
request. For ARC++, legacy fd passing will be kept for the time
being (b/157297349).

Bug: 147618164
Test: Files on DriveFS can be opened by an android app
Change-Id: I99e5704610d5a922a95e4c3d885b6b62d9b9a144
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2212114Reviewed-by: Naoki Fukino <fukino@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Commit-Queue: Cherie Cheung <cherieccy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774017}