Mobile: Restore painted content for fullscreen video.

It is no longer necessary to disable the background-image and border
properties for fullscreen video on Android because commit
014e89fdbe83fd895898331249f9bba28cc71130 does this in a non-exposed way.

(Actually rendering such content is still in progress.)

BUG=618753

Review-Url: https://codereview.chromium.org/2103953006
Cr-Commit-Position: refs/heads/master@{#404727}
1 file changed