GitLab

Replace the runtime feature OverlayFullscreenVideo by
ForceOverlayFullscreenVideo. A previous change allows WebMediaPlayer
to decide whether to do overlay video, so this is no longer needed. The
replacement allows the feature to be forced on for layout tests.

BUG=511376
TEST=virtual/android/fullscreen layout tests, manual

Review URL: https://codereview.chromium.org/1311763004

git-svn-id: svn://svn.chromium.org/blink/trunk@201253 bbb929c8-8fbe-4397-9dbb-9b2b20218538