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This partially reverts commit 8af6f946.

Relands PIXEL_FORMAT_UYVY and resets the optimal pixel format in
AVFoundation to UYVY.

This fixes the link bug in which camera capture with resolution lower
than 720p appears to have a dropped framerate on Mac.

Verified fix by visiting
https://webrtc.github.io/samples/src/content/devices/input-output/ and
selecting an attached usb camera.

Bug: 1035077,1027325
Change-Id: I7c3810c3382b4f4f8290210eec3ca5f8c9c4343a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2068819Reviewed-by: Emily Stark <estark@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Commit-Queue: Sasha McIntosh <sashamcintosh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751129}