Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGFEDiffuseLightingElement.h

Index: Source/core/svg/SVGFEDiffuseLightingElement.h
diff --git a/Source/core/svg/SVGFEDiffuseLightingElement.h b/Source/core/svg/SVGFEDiffuseLightingElement.h
index 250577f58d74fad663c10898d02a5388eddd08d4..6e94ffecb5cdf82c9c4e8dc7b84ea891f495033b 100644
--- a/Source/core/svg/SVGFEDiffuseLightingElement.h
+++ b/Source/core/svg/SVGFEDiffuseLightingElement.h
@@ -26,6 +26,7 @@
 #include "core/svg/SVGAnimatedNumberOptionalNumber.h"
 #include "core/svg/SVGFELightElement.h"
 #include "core/svg/SVGFilterPrimitiveStandardAttributes.h"
+#include "platform/heap/Handle.h"
 
 namespace blink {
 
@@ -41,6 +42,8 @@ public:
     SVGAnimatedNumber* kernelUnitLengthY() { return m_kernelUnitLength->secondNumber(); }
     SVGAnimatedString* in1() { return m_in1.get(); }
 
+    virtual void trace(Visitor*) override;
+
 private:
     explicit SVGFEDiffuseLightingElement(Document&);
 
@@ -48,12 +51,12 @@ private:
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) override;
     virtual bool setFilterEffectAttribute(FilterEffect*, const QualifiedName&) override;
     virtual void svgAttributeChanged(const QualifiedName&) override;
-    virtual PassRefPtr<FilterEffect> build(SVGFilterBuilder*, Filter*) override;
+    virtual PassRefPtrWillBeRawPtr<FilterEffect> build(SVGFilterBuilder*, Filter*) override;
 
-    RefPtr<SVGAnimatedNumber> m_diffuseConstant;
-    RefPtr<SVGAnimatedNumber> m_surfaceScale;
-    RefPtr<SVGAnimatedNumberOptionalNumber> m_kernelUnitLength;
-    RefPtr<SVGAnimatedString> m_in1;
+    RefPtrWillBeMember<SVGAnimatedNumber> m_diffuseConstant;
+    RefPtrWillBeMember<SVGAnimatedNumber> m_surfaceScale;
+    RefPtrWillBeMember<SVGAnimatedNumberOptionalNumber> m_kernelUnitLength;
+    RefPtrWillBeMember<SVGAnimatedString> m_in1;
 };
 
 } // namespace blink