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Change MediaStreamVideoSource::StartSourceImpl to use VideoCaptureFormat instead of VideoCaptureParams.
MediaStreamVideoSource only need the VideoCaptureFormat and thus should not pass VideoCaptureParams to its implementations.
This just a small code cleanup and does not change any behaviour.

TBR=bbudge@chromium.org

Review URL: https://codereview.chromium.org/528783002

Cr-Commit-Position: refs/heads/master@{#293924}