DevTools: make DOMNodeIds a trivial wrapper around WeakIdentifierMap

Source/core/dom/DOMNodeIds.h

Index: Source/core/dom/DOMNodeIds.h
diff --git a/Source/core/dom/DOMNodeIds.h b/Source/core/dom/DOMNodeIds.h
index e8b18c3dbf4b4b66f3f89806ef0ef067b1bbb817..2defabbe288955e26a07a79baf692fed5466562a 100644
--- a/Source/core/dom/DOMNodeIds.h
+++ b/Source/core/dom/DOMNodeIds.h
@@ -6,11 +6,21 @@
 #define DOMNodeIds_h
 
 #include "core/CoreExport.h"
+#include "core/dom/WeakIdentifierMap.h"
 
 namespace blink {
 
 class Node;
 
+#if !ENABLE(OILPAN)
+template<> struct WeakIdentifierMapTraits<Node> {
+    static void removedFromIdentifierMap(Node*);
+    static void addedToIdentifierMap(Node*);
+};
+#endif
+
+typedef WeakIdentifierMap<Node> WeakNodeMap;
+
 class CORE_EXPORT DOMNodeIds {
 public:
     static int idForNode(Node*);