Use webrtc::VideoFrameType rather than webrtc::FrameType

Intended to enable landing of
https://webrtc-review.googlesource.com/c/src/+/126225

Bug: webrtc:5876
Change-Id: Ib6ecc94d5af7e7fe1588a2c229872e41ffcc64f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1526273
Reviewed-by: Gary Kacmarcik <garykac@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Niels Möller <nisse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641997}
6 files changed