Revert of Add runtime feature and property names for unprefixed CSS Transforms (https://codereview.chromium.org/211033002/)

Reason for revert:
Breaks perf test: src/tools/perf/tough_animation_cases/transform_transition_js_block.html

BUG=356859

Original issue's description:
> Add runtime feature and property names for unprefixed CSS Transforms
> 
> Adds a runtime flag (enabled only for testing) and defines property names
> for each property defined in CSS Transforms[1]. Future patches will make
> these properties functional.
> 
> [1] http://www.w3.org/TR/css3-transforms/
> 
> BUG=154772
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=170005
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=170149

TBR=eseidel@chromium.org,esprehn@chromium.org,dstockwell@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=154772

Review URL: https://codereview.chromium.org/215773003

git-svn-id: svn://svn.chromium.org/blink/trunk@170228 bbb929c8-8fbe-4397-9dbb-9b2b20218538