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The media controls were performing manual paint invalidation
from when we used to have MediaControlPainter. Now we use
CSS this is handled for us automatically.

According to manual testing this reduces the time painting
from 153 ms to 49ms.

BUG=821961,821414

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: Ie864f914c7ced0031710d81a7a702c8e3697a312
Reviewed-on: https://chromium-review.googlesource.com/998834
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548832}