Pass isolate to v8::Undefined() function

Source/bindings/v8/NPV8Object.cpp

Index: Source/bindings/v8/NPV8Object.cpp
diff --git a/Source/bindings/v8/NPV8Object.cpp b/Source/bindings/v8/NPV8Object.cpp
index eed1b96c237e5b8a68cf82b3aa777297e9c9ca34..ec367e1e1f1a21df25ffff5ed0ead8505b4ce020 100644
--- a/Source/bindings/v8/NPV8Object.cpp
+++ b/Source/bindings/v8/NPV8Object.cpp
@@ -444,7 +444,7 @@ bool _NPN_RemoveProperty(NPP npp, NPObject* npObject, NPIdentifier propertyName)
 
     v8::Handle<v8::Object> obj = v8::Local<v8::Object>::New(isolate, object->v8Object);
     // FIXME: Verify that setting to undefined is right.
-    obj->Set(npIdentifierToV8Identifier(propertyName), v8::Undefined());
+    obj->Set(npIdentifierToV8Identifier(propertyName), v8::Undefined(isolate));
     return true;
 }