Revert of CSS Transforms: Implement transform-style (https://codereview.chromium.org/211123002/)

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

BUG=356859

Original issue's description:
> CSS Transforms: Implement transform-style
> 
> Implements transform-style as defined in CSS Transforms[1]. Behavior is
> identical to -webkit-transform-style.
> 
> Note, this property is guarded by the CSSTransformsUnprefixed runtime feature
> (enabled only for testing).
> 
> [1] http://www.w3.org/TR/css3-transforms/
> 
> BUG=154772
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=170013
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=170166

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

Review URL: https://codereview.chromium.org/215843003

git-svn-id: svn://svn.chromium.org/blink/trunk@170227 bbb929c8-8fbe-4397-9dbb-9b2b20218538