Revert of Move all RefPtr's to CSSValue to oilpan transition types

Source/core/css/StylePropertySet.h

Index: Source/core/css/StylePropertySet.h
diff --git a/Source/core/css/StylePropertySet.h b/Source/core/css/StylePropertySet.h
index 22c6c72125b316aa55a63b88b2ded430ec777548..50087aa3b2e7c5ba6c934eadbee7723791eb94db 100644
--- a/Source/core/css/StylePropertySet.h
+++ b/Source/core/css/StylePropertySet.h
@@ -182,7 +182,7 @@
 
     unsigned propertyCount() const { return m_propertyVector.size(); }
 
-    void addParsedProperties(const WillBeHeapVector<CSSProperty, 256>&);
+    void addParsedProperties(const Vector<CSSProperty, 256>&);
     void addParsedProperty(const CSSProperty&);
 
     // These expand shorthand properties into multiple properties.
@@ -222,7 +222,7 @@
 
     friend class StylePropertySet;
 
-    WillBePersistentHeapVector<CSSProperty, 4> m_propertyVector;
+    Vector<CSSProperty, 4> m_propertyVector;
 };
 
 DEFINE_TYPE_CASTS(MutableStylePropertySet, StylePropertySet, set, set->isMutable(), set.isMutable());