Move CSSCalcExpressionNode and subclasses to the oilpan heap.

Source/core/animation/AnimatableLength.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 120 matching lines @@
 bool AnimatableLength::equalTo(const AnimatableValue* value) const
 {
     const AnimatableLength* length = toAnimatableLength(value);
     if (m_unitType != length->m_unitType)
         return false;
     if (isCalc())
         return m_calcExpression == length->m_calcExpression || m_calcExpression->equals(*length->m_calcExpression);
     return m_number == length->m_number;
 }
 
-PassRefPtr<CSSCalcExpressionNode> AnimatableLength::toCSSCalcExpressionNode() const
+PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> AnimatableLength::toCSSCalcExpressionNode() const
 {
     if (isCalc())
         return m_calcExpression;
     return CSSCalcValue::createExpressionNode(toCSSPrimitiveValue(AllValues), m_number == trunc(m_number));
 }
 
 static bool isCompatibleWithRange(const CSSPrimitiveValue* primitiveValue, NumberRange range)
 {
     ASSERT(primitiveValue);
     if (range == AllValues)
@@ skipping 87 matching lines @@
     case UnitTypeViewportMax:
         return CSSPrimitiveValue::CSS_VMAX;
     case UnitTypeCalc:
         return CSSPrimitiveValue::CSS_UNKNOWN;
     }
     ASSERT_NOT_REACHED();
     return CSSPrimitiveValue::CSS_UNKNOWN;
 }
 
 } // namespace WebCore