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This is the first step to unify media_devices.typemap and
media_devices_for_blink.typemap. Basically, the former will be
used as-is from Blink when the work done.

Note that, the approach could have been backwards, ie use
blink.mojom.MediaDeviceTypes throughout the code and remove
blink::MediaDeviceTypes, however that would result in a way
bigger CL (see [1] for reference), since today blink::MediaDeviceTypes
enum item are used mainly for indexing vectors, and
blink::mojom::MediaDeviceTypes class enum items can be implicitly
converted to int, for similar purposes.

[1] https://crrev.com/c/2106015

Since 'blink::mojom::MediaDeviceTypes type' parameter is actually
unused in blink::MediaDevices::OnDevicesChange(), it is possible to
consider removing the parameter and the blink.mojom.MediaDeviceTypes
definition altogether from media_devices.mojom.

BUG=704136
R=guidou@chromium.org

Change-Id: Id3d42c3bbde30a7dd02b92439b867764e4211073
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2105794Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#750922}