Move most of the [Pass]RefPtr's of CSSPrimitiveValue to our transition types.

Source/core/css/CSSCrossfadeValue.cpp

 /*
  * Copyright (C) 2011 Apple Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 202 matching lines @@
 
 bool CSSCrossfadeValue::equals(const CSSCrossfadeValue& other) const
 {
     return compareCSSValuePtr(m_fromValue, other.m_fromValue)
         && compareCSSValuePtr(m_toValue, other.m_toValue)
         && compareCSSValuePtr(m_percentageValue, other.m_percentageValue);
 }
 
 void CSSCrossfadeValue::traceAfterDispatch(Visitor* visitor)
 {
+    visitor->trace(m_percentageValue);
     CSSImageGeneratorValue::traceAfterDispatch(visitor);
 }
 
 } // namespace WebCore