Ensure proper finalization of garbage-collected types.

Source/core/css/CSSCalculationValue.cpp

 /*
  * Copyright (C) 2011, 2012 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 156 matching lines @@
 double CSSCalcValue::doubleValue() const
 {
     return clampToPermittedRange(m_expression->doubleValue());
 }
 
 double CSSCalcValue::computeLengthPx(const CSSToLengthConversionData& conversionData) const
 {
     return clampToPermittedRange(m_expression->computeLengthPx(conversionData));
 }
 
-CSSCalcExpressionNode::~CSSCalcExpressionNode()
-{
-}
+DEFINE_EMPTY_DESTRUCTOR_WILL_BY_NONE(CSSCalcExpressionNode)
 
 class CSSCalcPrimitiveValue FINAL : public CSSCalcExpressionNode {
     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
 public:
 
     static PassRefPtrWillBeRawPtr<CSSCalcPrimitiveValue> create(PassRefPtrWillBeRawPtr<CSSPrimitiveValue> value, bool isInteger)
     {
         return adoptRefWillBeNoop(new CSSCalcPrimitiveValue(value, isInteger));
     }
 
@@ skipping 570 matching lines @@
     return adoptRefWillBeRefCountedGarbageCollected(new CSSCalcValue(expression, range));
 }
 
 void CSSCalcValue::traceAfterDispatch(Visitor* visitor)
 {
     visitor->trace(m_expression);
     CSSValue::traceAfterDispatch(visitor);
 }
 
 } // namespace WebCore