Convert DOMWrapperMap to use PersistentValueMap

Source/bindings/v8/V8NPObject.cpp

Index: Source/bindings/v8/V8NPObject.cpp
diff --git a/Source/bindings/v8/V8NPObject.cpp b/Source/bindings/v8/V8NPObject.cpp
index a3f8ab7566c8219ff8ac88292599c05ee6b53164..4020f925f657b1e698788adc7b9a7a7ba0c6cd20 100644
--- a/Source/bindings/v8/V8NPObject.cpp
+++ b/Source/bindings/v8/V8NPObject.cpp
@@ -404,18 +404,8 @@ static DOMWrapperMap<NPObject>& staticNPObjectMap()
     return npObjectMap;
 }
 
-template<>
-inline void DOMWrapperMap<NPObject>::setWeakCallback(const v8::WeakCallbackData<v8::Object, DOMWrapperMap<NPObject> >& data)
+void DOMWrapperMapDisposeHelper(NPObject* npObject)
 {
-    NPObject* npObject = static_cast<NPObject*>(toNative(data.GetValue()));
-
-    ASSERT(npObject);
-    ASSERT(staticNPObjectMap().containsKeyAndValue(npObject, data.GetValue()));
-
-    // Must remove from our map before calling _NPN_ReleaseObject(). _NPN_ReleaseObject can
-    // call forgetV8ObjectForNPObject, which uses the table as well.
-    staticNPObjectMap().removeAndDispose(npObject);
-
     if (_NPN_IsAlive(npObject))
         _NPN_ReleaseObject(npObject);
 }