Revert of Oilpan: Move CSSStyleDeclaration and subclasses to the heap using transistion types. (https://codereview.chromium.org/195953003/)

Reason for revert:
Breaking tests.

Original issue's description:
> Oilpan: Move CSSStyleDeclaration and subclasses to the heap using transistion types.
> 
> 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
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=169652

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

Review URL: https://codereview.chromium.org/205033007

git-svn-id: svn://svn.chromium.org/blink/trunk@169661 bbb929c8-8fbe-4397-9dbb-9b2b20218538