Revert of Oilpan: Prepare moving media control elements to oilpan (https://codereview.chromium.org/279793002/)

Reason for revert:
speculative revert to see whether this related to some non-oilpan media element crashes that started around the same time.

Original issue's description:
> Oilpan: Prepare moving media control elements to oilpan
> 
> BUG=357163
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=173868

TBR=tkent@chromium.org,oilpan-reviews@chromium.org,ager@chromium.org,keishi@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=357163

Review URL: https://codereview.chromium.org/284203008

git-svn-id: svn://svn.chromium.org/blink/trunk@174137 bbb929c8-8fbe-4397-9dbb-9b2b20218538