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

Source/core/css/StylePropertySet.cpp

Index: Source/core/css/StylePropertySet.cpp
diff --git a/Source/core/css/StylePropertySet.cpp b/Source/core/css/StylePropertySet.cpp
index d4bf57f6299fb96a0c03954bdba489bd15b0d2f9..b94321207482546708db8d83030af39a279bfd78 100644
--- a/Source/core/css/StylePropertySet.cpp
+++ b/Source/core/css/StylePropertySet.cpp
@@ -540,7 +540,7 @@
         ASSERT(!m_cssomWrapper->parentElement());
         return m_cssomWrapper.get();
     }
-    m_cssomWrapper = adoptPtrWillBeNoop(new PropertySetCSSStyleDeclaration(*this));
+    m_cssomWrapper = adoptPtr(new PropertySetCSSStyleDeclaration(*this));
     return m_cssomWrapper.get();
 }
 
@@ -562,7 +562,6 @@
 
 void MutableStylePropertySet::traceAfterDispatch(Visitor* visitor)
 {
-    visitor->trace(m_cssomWrapper);
     visitor->trace(m_propertyVector);
     StylePropertySet::traceAfterDispatch(visitor);
 }