Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGPathSegListBuilder.cpp

Index: Source/core/svg/SVGPathSegListBuilder.cpp
diff --git a/Source/core/svg/SVGPathSegListBuilder.cpp b/Source/core/svg/SVGPathSegListBuilder.cpp
index e3ae3856ce79533cc0257b7ef966f6b20d85b540..7a4afb3ee325e2c3d695ee83afd35d9e6c9613fa 100644
--- a/Source/core/svg/SVGPathSegListBuilder.cpp
+++ b/Source/core/svg/SVGPathSegListBuilder.cpp
@@ -50,11 +50,18 @@
 namespace blink {
 
 SVGPathSegListBuilder::SVGPathSegListBuilder()
-    : m_pathElement(0)
+    : m_pathElement(nullptr)
     , m_pathSegList(nullptr)
 {
 }
 
+void SVGPathSegListBuilder::trace(Visitor* visitor)
+{
+    visitor->trace(m_pathElement);
+    visitor->trace(m_pathSegList);
+    SVGPathConsumer::trace(visitor);
+}
+
 void SVGPathSegListBuilder::moveTo(const FloatPoint& targetPoint, bool, PathCoordinateMode mode)
 {
     ASSERT(m_pathElement);