Remove HTMLOutputElementCustom which is no longer needed.

Source/WebCore/bindings/dart/custom/DartHTMLCollectionCustom.cpp

 // 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 21 matching lines @@
 
 #include "DartDOMWrapper.h"
 #include "DartHTMLAllCollection.h"
 #include "DartHTMLCollection.h"
 #include "DartNode.h"
 #include "HTMLAllCollection.h"
 #include "HTMLCollection.h"
 
 namespace WebCore {
 
-namespace DartHTMLCollectionInternal {
-
-// This method is custom in JavaScript.
-void itemCallback(Dart_NativeArguments args)
-{
-    DartApiScope dartApiScope;
-    Dart_Handle exception = 0;
-    {
-        HTMLCollection* receiver = DartDOMWrapper::receiver<HTMLCollection>(args);
-        unsigned index = DartUtilities::dartToUnsigned(Dart_GetNativeArgument(args, 1), exception);
-        if (exception)
-            goto fail;
-
-        DartDOMWrapper::returnValue<DartNode>(args, receiver->item(index));
-        return;
-    }
-
-fail:
-    Dart_ThrowException(exception);
-    ASSERT_NOT_REACHED();
-}
-
-void namedItemCallback(Dart_NativeArguments)
-{
-    // FIXME: proper implementation.
-    DART_UNIMPLEMENTED();
-}
-
-}
-
 Dart_Handle DartHTMLCollection::toDart(HTMLCollection* collection)
 {
     if (!collection)
         return 0;
 
     if (collection->type() == DocAll)
         return DartHTMLAllCollection::toDart(static_cast<HTMLAllCollection*>(collection));
     return DartDOMWrapper::toDart<DartHTMLCollection>(collection);
 }
 
 }