Oilpan: move ClientRect and its list to the oilpan heap.

Source/core/dom/ClientRectList.cpp

Index: Source/core/dom/ClientRectList.cpp
diff --git a/Source/core/dom/ClientRectList.cpp b/Source/core/dom/ClientRectList.cpp
index c7d054c15940db63259a892d68e63217259a9df5..eb47249f3f1f32c177289dd6577911941ee9c908 100644
--- a/Source/core/dom/ClientRectList.cpp
+++ b/Source/core/dom/ClientRectList.cpp
@@ -64,4 +64,9 @@ ClientRect* ClientRectList::item(unsigned index)
     return m_list[index].get();
 }
 
+void ClientRectList::trace(Visitor *visitor)
+{
+    visitor->trace(m_list);
+}
+
 } // namespace WebCore