Revert of EasyUnlock: Work around the ghost overlay from CSS animation. (patchset #3 id:40001 of https://codereview.chromium.org/
487373002/)
Reason for revert:
No longer needed since underlying blink issue http://crbug.com/405250 is fixed.
Original issue's description:
> EasyUnlock: Work around the ghost overlay from CSS animation.
>
> BUG=404779
>
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=290743
TBR=tbarzic@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=404779
Review URL: https://codereview.chromium.org/
521343002
Cr-Commit-Position: refs/heads/master@{#292816}