[Media Foundation Video Capture] Enable by default

Set the the base::Feature for MediaFoundationVideoCapture to be enabled
by default. The feature has been enabled per finch config at 100% on
stable since October.

Bug: 792640
Change-Id: I31a4d34c0e10eebe0c917711831274465e28631d
Reviewed-on: https://chromium-review.googlesource.com/c/1393886
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Christian Fremerey <chfremer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#621848}
1 file changed