Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/properties/SVGPropertyHelper.h

Index: Source/core/svg/properties/SVGPropertyHelper.h
diff --git a/Source/core/svg/properties/SVGPropertyHelper.h b/Source/core/svg/properties/SVGPropertyHelper.h
index b60d75c1e893d130f10bdcd28dd400d47e598282..aa1b1e5f5f6d3a3c732d1b9a4150d26ceb6a1034 100644
--- a/Source/core/svg/properties/SVGPropertyHelper.h
+++ b/Source/core/svg/properties/SVGPropertyHelper.h
@@ -18,14 +18,14 @@ public:
     {
     }
 
-    virtual PassRefPtr<SVGPropertyBase> cloneForAnimation(const String& value) const
+    virtual PassRefPtrWillBeRawPtr<SVGPropertyBase> cloneForAnimation(const String& value) const
     {
-        RefPtr<Derived> property = Derived::create();
+        RefPtrWillBeRawPtr<Derived> property = Derived::create();
         property->setValueAsString(value, IGNORE_EXCEPTION);
         return property.release();
     }
 };
 
-}
+} // namespace blink
 
 #endif // SVGPropertyHelper_h