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The existing media foundation encoding path has been enabled by
default for a long time. Remove the old switch in preparation for
a new one which controls usage of the asynchronous MFT.

Bug: 982799
Change-Id: I9456029bf38f5af3710b93d693876f20e69d2768
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2135313Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756363}