Oilpan: move LiveNodeList collections to the heap.

Source/core/dom/LiveNodeList.cpp

Index: Source/core/dom/LiveNodeList.cpp
diff --git a/Source/core/dom/LiveNodeList.cpp b/Source/core/dom/LiveNodeList.cpp
index 7425e9cbf99404b4ed3f77ba930571e578d62d78..083410617a4d3895951dd422fabcfc9b71e98eba 100644
--- a/Source/core/dom/LiveNodeList.cpp
+++ b/Source/core/dom/LiveNodeList.cpp
@@ -60,4 +60,11 @@ Element* LiveNodeList::traverseBackwardToOffset(unsigned offset, Element& curren
     return traverseMatchingElementsBackwardToOffset(*this, offset, currentNode, currentOffset);
 }
 
+void LiveNodeList::trace(Visitor* visitor)
+{
+    m_collectionIndexCache.traceAfterDispatch(visitor);
+    LiveNodeListBase::trace(visitor);
+    NodeList::trace(visitor);
+}
+
 } // namespace WebCore