Oilpan: Move CSSStyleDeclaration and subclasses to the heap using transistion types.

Source/core/css/CSSKeyframeRule.cpp

Index: Source/core/css/CSSKeyframeRule.cpp
diff --git a/Source/core/css/CSSKeyframeRule.cpp b/Source/core/css/CSSKeyframeRule.cpp
index 20e1e4755ae23831778d4db1c2b4146fcad20036..03abda087ccab6861d4492352d51d0c1a3ed050d 100644
--- a/Source/core/css/CSSKeyframeRule.cpp
+++ b/Source/core/css/CSSKeyframeRule.cpp
@@ -146,8 +146,10 @@ CSSKeyframeRule::CSSKeyframeRule(StyleKeyframe* keyframe, CSSKeyframesRule* pare
 
 CSSKeyframeRule::~CSSKeyframeRule()
 {
+#if !ENABLE(OILPAN)
     if (m_propertiesCSSOMWrapper)
         m_propertiesCSSOMWrapper->clearParentRule();
+#endif
 }
 
 CSSStyleDeclaration* CSSKeyframeRule::style() const
@@ -163,4 +165,10 @@ void CSSKeyframeRule::reattach(StyleRuleBase*)
     ASSERT_NOT_REACHED();
 }
 
+void CSSKeyframeRule::trace(Visitor* visitor)
+{
+    visitor->trace(m_propertiesCSSOMWrapper);
+    CSSRule::trace(visitor);
+}
+
 } // namespace WebCore