Oilpan: move SVG property hierarchy to the heap.

Source/platform/graphics/filters/FEDropShadow.cpp

Index: Source/platform/graphics/filters/FEDropShadow.cpp
diff --git a/Source/platform/graphics/filters/FEDropShadow.cpp b/Source/platform/graphics/filters/FEDropShadow.cpp
index 42d7d404e34f3cdec1dd975809d26624d1df9163..b928e2de1c9fbf2c6708606429b370dea9028781 100644
--- a/Source/platform/graphics/filters/FEDropShadow.cpp
+++ b/Source/platform/graphics/filters/FEDropShadow.cpp
@@ -40,9 +40,9 @@ FEDropShadow::FEDropShadow(Filter* filter, float stdX, float stdY, float dx, flo
 {
 }
 
-PassRefPtr<FEDropShadow> FEDropShadow::create(Filter* filter, float stdX, float stdY, float dx, float dy, const Color& shadowColor, float shadowOpacity)
+PassRefPtrWillBeRawPtr<FEDropShadow> FEDropShadow::create(Filter* filter, float stdX, float stdY, float dx, float dy, const Color& shadowColor, float shadowOpacity)
 {
-    return adoptRef(new FEDropShadow(filter, stdX, stdY, dx, dy, shadowColor, shadowOpacity));
+    return adoptRefWillBeNoop(new FEDropShadow(filter, stdX, stdY, dx, dy, shadowColor, shadowOpacity));
 }
 
 FloatRect FEDropShadow::mapRect(const FloatRect& rect, bool forward)