Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGAnimatedLength.h

Index: Source/core/svg/SVGAnimatedLength.h
diff --git a/Source/core/svg/SVGAnimatedLength.h b/Source/core/svg/SVGAnimatedLength.h
index 54f8c2bc8d948b85b31f1cfb4ada772d8150e320..a1370818f308469ee090405c3a8ef2ccff105d15 100644
--- a/Source/core/svg/SVGAnimatedLength.h
+++ b/Source/core/svg/SVGAnimatedLength.h
@@ -38,16 +38,16 @@ namespace blink {
 
 class SVGAnimatedLength : public SVGAnimatedProperty<SVGLength> {
 public:
-    static PassRefPtr<SVGAnimatedLength> create(SVGElement* contextElement, const QualifiedName& attributeName, PassRefPtr<SVGLength> initialValue, SVGLengthNegativeValuesMode negativeValuesMode)
+    static PassRefPtrWillBeRawPtr<SVGAnimatedLength> create(SVGElement* contextElement, const QualifiedName& attributeName, PassRefPtrWillBeRawPtr<SVGLength> initialValue, SVGLengthNegativeValuesMode negativeValuesMode)
     {
-        return adoptRef(new SVGAnimatedLength(contextElement, attributeName, initialValue, negativeValuesMode));
+        return adoptRefWillBeNoop(new SVGAnimatedLength(contextElement, attributeName, initialValue, negativeValuesMode));
     }
 
     void setDefaultValueAsString(const String&);
     void setBaseValueAsString(const String&, SVGParsingError&) override;
 
 protected:
-    SVGAnimatedLength(SVGElement* contextElement, const QualifiedName& attributeName, PassRefPtr<SVGLength> initialValue, SVGLengthNegativeValuesMode negativeValuesMode)
+    SVGAnimatedLength(SVGElement* contextElement, const QualifiedName& attributeName, PassRefPtrWillBeRawPtr<SVGLength> initialValue, SVGLengthNegativeValuesMode negativeValuesMode)
         : SVGAnimatedProperty<SVGLength>(contextElement, attributeName, initialValue)
         , m_negativeValuesMode(negativeValuesMode)
     {