Oilpan: move SVG property hierarchy to the heap.

Source/platform/graphics/filters/ReferenceFilter.cpp

Index: Source/platform/graphics/filters/ReferenceFilter.cpp
diff --git a/Source/platform/graphics/filters/ReferenceFilter.cpp b/Source/platform/graphics/filters/ReferenceFilter.cpp
index bbbb15b85e7b37290d3fb07a87c005359cc98598..60d1dd20104038cd9d313f7387f86d408f6667aa 100644
--- a/Source/platform/graphics/filters/ReferenceFilter.cpp
+++ b/Source/platform/graphics/filters/ReferenceFilter.cpp
@@ -43,13 +43,20 @@ ReferenceFilter::ReferenceFilter(float scale)
 {
 }
 
-void ReferenceFilter::setLastEffect(PassRefPtr<FilterEffect> effect)
+ReferenceFilter::~ReferenceFilter()
 {
-    m_lastEffect = effect;
 }
 
-ReferenceFilter::~ReferenceFilter()
+void ReferenceFilter::trace(Visitor* visitor)
 {
+    visitor->trace(m_sourceGraphic);
+    visitor->trace(m_lastEffect);
+    Filter::trace(visitor);
+}
+
+void ReferenceFilter::setLastEffect(PassRefPtrWillBeRawPtr<FilterEffect> effect)
+{
+    m_lastEffect = effect;
 }
 
 } // namespace blink