GitLab

This CL moves the permission checking in UsbDevice implementation
to WebUsbService by adjusting some mojo interfaces.

BUG=699790

Change-Id: Ie5842f1a433a8b05275b06f31f25320bcc10a4d7
Reviewed-on: https://chromium-review.googlesource.com/1166592
Commit-Queue: Donna Wu <donna.wu@intel.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582538}