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This CL introduces Mojom enum for content::MediaDeviceType and removes
its IPC_ENUM_TRAITS in favor of EnumTraits.
This is in preparation for migration of MediaDevices.enumerateDevices()
processing from content to Blink.

Bug: 764680
Change-Id: I5e3c96adb7fd96e1d0ea41dff933ecac017228fa
Reviewed-on: https://chromium-review.googlesource.com/806054Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Chandan Padhi <c.padhi@samsung.com>
Cr-Commit-Position: refs/heads/master@{#521971}