Oilpan: move LiveNodeList collections to the heap.

public/web/WebNode.h

Index: public/web/WebNode.h
diff --git a/public/web/WebNode.h b/public/web/WebNode.h
index 785514fce17a5be10f7d5d730c328e91722d120d..ba967ff76021db935fd113421c82374c7960c065 100644
--- a/public/web/WebNode.h
+++ b/public/web/WebNode.h
@@ -144,6 +144,18 @@ public:
     WebNode(const PassRefPtrWillBeRawPtr<WebCore::Node>&);
     WebNode& operator=(const PassRefPtrWillBeRawPtr<WebCore::Node>&);
     operator PassRefPtrWillBeRawPtr<WebCore::Node>() const;
+#if ENABLE(OILPAN)
+    // This constructor enables creation of WebNodes from Members
+    // holding WebCore::Node-derived objects (this shows up in WebVector
+    // assignments, for instance.) It is needed because a RawPtr<T> constructor
+    // from a Member<U> isn't provided, hence the above constructor
+    // won't be usable.
+    template<typename U>
+    WebNode(const WebCore::Member<U>& other, EnsurePtrConvertibleArgDecl(U, WebCore::Node))
+        : m_private(other.get())
+    {
+    }
+#endif
 #endif
 
 #if BLINK_IMPLEMENTATION