Fixing custom element type extensions to have correct native type

Source/bindings/dart/DartDOMWrapper.h

 // Copyright 2011, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //    * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //    * Redistributions in binary form must reproduce the above
@@ skipping 294 matching lines @@
     {
         typedef DartDOMWrapperTraits<BindingsClass> Traits;
 
         Dart_WeakPersistentHandle wrapper = Traits::MapTraits::domMap(domData)->get(domObject);
         ASSERT(Dart_IdentityEquals(Dart_HandleFromWeakPersistent(wrapper), oldInstance));
         Traits::MapTraits::domMap(domData)->remove(domObject);
         Traits::ActiveTraits::removeWrapper(domData, domObject);
         Traits::EventTargetTraits::removeWrapper(domData, domObject);
     }
 
+    friend class DartCustomElementConstructorBuilder;
     friend class DartCustomElementWrapper<HTMLElement>;
     friend class DartUtilities;
 };
 
 template<bool isNode>
 struct DartDOMWrapperMapTraits { };
 
 template<>
 struct DartDOMWrapperMapTraits<false> {
     static DartDOMObjectMap* domMap(DartDOMData* domData) { return domData->objectMap(); }
@@ skipping 65 matching lines @@
         static DartMessagePortMap* domMap(DartDOMData* domData) { return domData->messagePortMap(); }
     };
     typedef MessagePortMapTraits MapTraits;
     typedef DartDOMWrapperActiveTraits<DartMessagePort, false> ActiveTraits;
     typedef DartDOMWrapperEventTargetTraits<DartMessagePort, true> EventTargetTraits;
 };
 
 }
 
 #endif // DartDOMWrapper_h