Remove enable-webrtc-h264-with-openh264-ffmpeg chrome://flags.

The base::Feature is not removed because it is used by tests due to
this bug: https://crbug.com/868082.

Bug: 947516
Change-Id: I234e6da2b089de0726a589c748948959b2fdec37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1545400
Reviewed-by: Elly Fong-Jones <[email protected]>
Commit-Queue: Henrik Boström <[email protected]>
Cr-Commit-Position: refs/heads/master@{#646297}
3 files changed