Revert of Directly update composited transforms (https://codereview.chromium.org/365793005/)

Reason for revert:
Mac failures:

http://build.chromium.org/p/chromium.mac/buildstatus?builder=Mac%2010.6%20Tes...
http://build.chromium.org/p/chromium.mac/buildstatus?builder=Mac%2010.7%20Tes...
http://build.chromium.org/p/chromium.mac/buildstatus?builder=Mac%2010.7%20Tes...
and so on.

Original issue's description:
> Directly update composited transforms
> 
> This CL introduces a special case for updating composited transforms. Now when an
> element with an inline transform is composited, we can skip the bulk of the work
> in the compositing update and directly update the transform of its graphics layer.
> 
> To make this work, we need to skip the overlap test, which does work proportional
> to (the square of) the size of the document. We do this by assuming that later
> RenderLayers overlap layers that are composited and have inline transforms. Most
> of these layers will squash back down into a single graphics layer, so we won't
> cause a layer explosion.
> 
> In RenderLayer::styleChanged, we recognize the condition for a direct transform
> update and simply mark a single CompositedLayerMapping as needing a local graphics
> update. We could save more time by introducing a smaller GraphicsLayerUpdateScope
> just for transforms, but that's work for a future CL.
> 
> This CL makes the compositing update for the Polymer calculator ~9.1x faster. The
> entire time spent below WebViewImpl::layout is ~3.3x faster.
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=177495

TBR=chrishtr@chromium.org,esprehn@chromium.org,vollick@chromium.org,abarth@chromium.org
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/364333003

git-svn-id: svn://svn.chromium.org/blink/trunk@177543 bbb929c8-8fbe-4397-9dbb-9b2b20218538