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This CL migrates ArcVolumeMounterBridge.

BUG=672829
TEST=Ran try.

Change-Id: I14ecdea4d97940a4b0878f0624d0b0137263f453
Reviewed-on: https://chromium-review.googlesource.com/574511
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Luis Hector Chavez <lhchavez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487399}