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With this change, it is safe to enable the SYSTEM_MONITOR caching
policy for MediaDevicesManager.

Bug: 788687
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I3b067a566e825c5a8219705bc75ee4b66c198787
Reviewed-on: https://chromium-review.googlesource.com/822935Reviewed-by: Max Morin <maxmorin@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523716}