Onion soup media_stream_constraints_util_video_content.cc|h

As per the plan detailed in [1], this CL migrates
media_stream_constraints_util_video_content.cc and its respective
header to Blink.

[1] https://docs.google.com/document/d/1rHJGi1U72qZsOGIctIf7GKRaY8d7BgtVW8MaMYumzYY/

BUG=704136
R=guidou@chromium.org, haraken@chromium.org

Change-Id: I84d50a018d60b518a4eff704840e356f734bfe95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1653253
Reviewed-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@{#668351}
10 files changed