Revert 167798 "Change various helper classes to transition types..."

This CL broke a ton of tests in oilpan bots:
http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20Oilpan%20%28dbg%29/builds/672


> Change various helper classes to transition types to get CSSValue entirely onto the gc heap.
> 
> Specifically MediaQuery, MediaQueryExp, MediaQuerySet, and MediaList. Also added a few persistents in CSSImportRule, CSSMediaRule, CSSStyleSheet and MediaQueryList. Finally change FontFace to RefCountedGarbageCollected when oilpan is enabled. FontFace require a bit more separate work to move entirely so leaving that for a separate change.
> 
> R=ager@chromium.org, erik.corry@gmail.com, haraken@chromium.org, tkent@chromium.org, vegorov@chromium.org, zerny@chromium.org
> BUG=341815
> 
> Review URL: https://codereview.chromium.org/170283019

TBR=wibling@chromium.org

Review URL: https://codereview.chromium.org/177093022

git-svn-id: svn://svn.chromium.org/blink/trunk@167853 bbb929c8-8fbe-4397-9dbb-9b2b20218538