Oilpan: move SVG property hierarchy to the heap.

Source/core/rendering/RenderLayerFilterInfo.h

Index: Source/core/rendering/RenderLayerFilterInfo.h
diff --git a/Source/core/rendering/RenderLayerFilterInfo.h b/Source/core/rendering/RenderLayerFilterInfo.h
index 12f1c865a76bf1cd2a9be8e415cacb8cdaf5ee7f..be2ddc991930785c32ce899ba9477795f8e39ad0 100644
--- a/Source/core/rendering/RenderLayerFilterInfo.h
+++ b/Source/core/rendering/RenderLayerFilterInfo.h
@@ -54,7 +54,7 @@ public:
     static void removeFilterInfoForRenderLayer(RenderLayer*);
 
     FilterEffectRenderer* renderer() const { return m_renderer.get(); }
-    void setRenderer(PassRefPtr<FilterEffectRenderer>);
+    void setRenderer(PassRefPtrWillBeRawPtr<FilterEffectRenderer>);
 
     void updateReferenceFilterClients(const FilterOperations&);
     virtual void notifyFinished(Resource*) override;
@@ -66,7 +66,7 @@ private:
 
     RenderLayer* m_layer;
 
-    RefPtr<FilterEffectRenderer> m_renderer;
+    RefPtrWillBePersistent<FilterEffectRenderer> m_renderer;
 
     static RenderLayerFilterInfoMap* s_filterMap;
     WillBePersistentHeapVector<RefPtrWillBeMember<Element> > m_internalSVGReferences;