Oilpan: fix build after r200105.

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 167350780e11e7f52eef73afd1162b52962def6b..5c0f88ee4a3d8a0d365b46fcd01fb9e373a48603 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -5348,7 +5348,7 @@ void Document::updateHoverActiveState(const HitTestRequest& request, Element* in
     if (oldActiveElement && !request.active()) {
         // The oldActiveElement layoutObject is null, dropped on :active by setting display: none,
         // for instance. We still need to clear the ActiveChain as the mouse is released.
-        for (RefPtr<Node> node = oldActiveElement; node; node = ComposedTreeTraversal::parent(*node)) {
+        for (RefPtrWillBeRawPtr<Node> node = oldActiveElement; node; node = ComposedTreeTraversal::parent(*node)) {
             ASSERT(!node->isTextNode());
             node->setActive(false);
             m_userActionElements.setInActiveChain(node.get(), false);