Move CSSRuleList to the garbage collected heap

Source/core/css/CSSRule.h

Index: Source/core/css/CSSRule.h
diff --git a/Source/core/css/CSSRule.h b/Source/core/css/CSSRule.h
index 519ed90a86cf8a39fd58a026e6fed88daf164be2..ec9b39c4758f5075f78880b18dfda81a7fd9e26d 100644
--- a/Source/core/css/CSSRule.h
+++ b/Source/core/css/CSSRule.h
@@ -34,10 +34,7 @@ class CSSParserContext;
 class CSSStyleSheet;
 class StyleRuleBase;
 
-// FIXME: oilpan: CSSRuleList redirects increments and decrements of its
-// reference counts to its CSSRule. That means this has to be
-// RefCountedGarbageCollected instead of just GarbageCollected for now.
-class CSSRule : public RefCountedWillBeRefCountedGarbageCollected<CSSRule> {
+class CSSRule : public RefCountedWillBeGarbageCollectedFinalized<CSSRule> {
 public:
     virtual ~CSSRule() { }