Revert of Move all RefPtr's to CSSValue to oilpan transition types, except for the one in CSSCursorImageValue.

Revert of Move all RefPtr's to CSSValue to oilpan transition types, except for the one in CSSCursorImageValue. (https://codereview.chromium.org/184313004/)

Reason for revert:
Broke the build.

Original issue's description:
> Move all RefPtr's to CSSValue to oilpan transition types, except for the one in CSSCursorImageValue.
> 
> This change gets rid of all but one RefPtr to CSSValue. I have introduced a few persistents core/animation/..., core/css/StylePropertySet, and ElementStyleResources. I plan to attack the one in CSSCursorImageValue subsequently, and then change CSSValue from RefCountedGarbageCollected to GarbageCollectedFinalized.
> 
> R=ager@chromium.org, erik.corry@gmail.com, haraken@chromium.org, oilpan-reviews@chromium.org, tkent@chromium.org, vegorov@chromium.org, zerny@chromium.org
> BUG=341815
> NOTRY=true
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=168466
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=168635

TBR=ager@chromium.org,erik.corry@gmail.com,haraken@chromium.org,oilpan-reviews@chromium.org,tkent@chromium.org,vegorov@chromium.org,zerny@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=341815
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=168639

[wibling-chromium, 2014-03-06 14:19:45]

Created Revert of Move all RefPtr's to CSSValue to oilpan transition types,
except for the one in CSSCursorImageValue.