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This allows the Drive Web interface to talk to DriveFS on Chrome OS via
the native messaging api.

Bug: 1020954
Change-Id: I450e8ad46cc601e0b0d8df2c19dd4e255f963391
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1910982
Commit-Queue: Austin Tankiang <austinct@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Sergei Datsenko <dats@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716064}