Oilpan: move LiveNodeList collections to the heap.

Source/web/WebPageSerializer.cpp

Index: Source/web/WebPageSerializer.cpp
diff --git a/Source/web/WebPageSerializer.cpp b/Source/web/WebPageSerializer.cpp
index 2c1f37905ad5f1e1519408f8d0a5ecd0d19df3b9..2f1a501f4b88c3212d54352ef4791693ed350ae5 100644
--- a/Source/web/WebPageSerializer.cpp
+++ b/Source/web/WebPageSerializer.cpp
@@ -139,7 +139,7 @@ void retrieveResourcesForFrame(LocalFrame* frame,
         frameURLs->append(frameURL);
 
     // Now get the resources associated with each node of the document.
-    RefPtr<HTMLCollection> allElements = frame->document()->all();
+    RefPtrWillBeRawPtr<HTMLCollection> allElements = frame->document()->all();
     for (unsigned i = 0; i < allElements->length(); ++i) {
         Element* element = allElements->item(i);
         retrieveResourcesForElement(element,