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On Mac it can happen that certain cameras stop working system-wide after Chrome 
has been running for a while (potentially days) and the computer has gone 
through sleep/wakeup cycles.

This could potentially be related to DeviceMonitorMac interacting with 
VDCAssistant either at a bad time or in a bad way. To be able to test this 
theory, this CL adds a feature switch that allows disabling the use of 
DeviceMonitorMac.

Bug: 699446
Test: Run chromium on Mac with --disable-features=DeviceMonitorMac
Change-Id: Id2a06c75bca7ec8e2db37b4b9647fe508edb0327
Reviewed-on: https://chromium-review.googlesource.com/558199Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Commit-Queue: Christian Fremerey <chfremer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486933}