Oilpan: move LiveNodeList collections to the heap.

Source/web/WebPageSerializerImpl.cpp

Index: Source/web/WebPageSerializerImpl.cpp
diff --git a/Source/web/WebPageSerializerImpl.cpp b/Source/web/WebPageSerializerImpl.cpp
index 1d9878beb7001de230221579868519dde7edf03b..fe6f0334fd36289cc4140e3fa86f76599155d87b 100644
--- a/Source/web/WebPageSerializerImpl.cpp
+++ b/Source/web/WebPageSerializerImpl.cpp
@@ -473,7 +473,7 @@ void WebPageSerializerImpl::collectTargetFrames()
         // Get current using document.
         Document* currentDoc = currentFrame->frame()->document();
         // Go through sub-frames.
-        RefPtr<HTMLCollection> all = currentDoc->all();
+        RefPtrWillBeRawPtr<HTMLCollection> all = currentDoc->all();
 
         for (unsigned i = 0; Element* element = all->item(i); i++) {
             if (!element->isHTMLElement())