Adding hidden HTMLElement base class back for Dart2JS

tools/dom/scripts/generator.py

 #!/usr/bin/python
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 """This module provides shared functionality for systems to generate
 Dart APIs from the IDL database."""
 
 import copy
 import json
@@ skipping 683 matching lines @@
     if IsPureInterface(self.idl_type()):
       return self.idl_type()
     return self.interface_name()
 
   def interface_name(self):
     return self._dart_interface_name
 
   def implementation_name(self):
     implementation_name = self._dart_interface_name
     if self.merged_into():
-      implementation_name = '_%s_Merged' % implementation_name
+      return '_%s' % self.idl_type()
 
     if not self.has_generated_interface():
       implementation_name = '_%s' % implementation_name
 
     return implementation_name
 
   def native_type(self):
     database = self._type_registry._database
     if database.HasInterface(self.idl_type()):
       interface = database.GetInterface(self.idl_type())
@@ skipping 428 matching lines @@
           type_name, type_data, dart_interface_name, self)
 
     if type_data.clazz == 'BasicTypedList':
       dart_interface_name = self._renamer.RenameInterface(
           self._database.GetInterface(type_name))
       return BasicTypedListIDLTypeInfo(
           type_name, type_data, dart_interface_name, self)
 
     class_name = '%sIDLTypeInfo' % type_data.clazz
     return globals()[class_name](type_name, type_data)