Revert of aura: Remove old GL paths from RenderWidgetHostViewAura. (https://codereview.chromium.org/131443007/)

Reason for revert:
This patch is causing hundreds of layouttest timouts in Blink (see: http://goo.gl/6tX16t). My investigation is at crbug.com/341344. I'm going to roll this out for now to try to green the Blink tree.

BUG=341344

Original issue's description:
> aura: Remove old GL paths from RenderWidgetHostViewAura.
> 
> Frames from the renderer are either legacy software,
> software compositing, or ubercomp. Remove the old GL composited
> paths that are no longer in use.
> 
> R=piman
> BUG=332998
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=249226

TBR=piman@chromium.org,fsamuel@chromium.org,phajdan.jr@chromium.org,danakj@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=332998

Review URL: https://codereview.chromium.org/150153003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249298 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249298