Oilpan: Prepare to move RenderObject and RenderObjectChildList to Oilpan heap.

Source/core/rendering/svg/RenderSVGRoot.cpp

Index: Source/core/rendering/svg/RenderSVGRoot.cpp
diff --git a/Source/core/rendering/svg/RenderSVGRoot.cpp b/Source/core/rendering/svg/RenderSVGRoot.cpp
index 6d554622faaed5e156de2f4ac828c7b9af446eee..6ed4a5d3049f78dc2bd676f51b2f847a145723c6 100644
--- a/Source/core/rendering/svg/RenderSVGRoot.cpp
+++ b/Source/core/rendering/svg/RenderSVGRoot.cpp
@@ -56,6 +56,12 @@ RenderSVGRoot::~RenderSVGRoot()
 {
 }
 
+void RenderSVGRoot::trace(Visitor* visitor)
+{
+    visitor->trace(m_children);
+    RenderReplaced::trace(visitor);
+}
+
 void RenderSVGRoot::computeIntrinsicRatioInformation(FloatSize& intrinsicSize, double& intrinsicRatio) const
 {
     // Spec: http://www.w3.org/TR/SVG/coords.html#IntrinsicSizing