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... instead of WebMediaStreamTrack.

CL also converts ImageCaptureFrameGragger for the same.

This is part of the effort to reduce the needless use of
public Blink APIs (wrappers) within renderer/modules.

BUG=704136
R=guidou@chromium.org

Change-Id: I432385671c44a6700316db6b58bf5c190cfba3ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2248062Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#779921}