Do not merge IDL interfaces in dartdomgenerator.

lib/dom/scripts/dartgenerator.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 generates Dart APIs from the IDL database."""
 
 import emitter
 import idlnode
 import logging
@@ skipping 62 matching lines @@
     """
 
     if conversion_table is None:
       conversion_table = {}
 
     # Rename interfaces:
     for old_name, new_name in conversion_table.items():
       if database.HasInterface(old_name):
         _logger.info('renaming interface %s to %s' % (old_name, new_name))
         interface = database.GetInterface(old_name)
-        database.DeleteInterface(old_name)
         if not database.HasInterface(new_name):
           interface.id = new_name
+          database.DeleteInterface(old_name)
           database.AddInterface(interface)
-        else:
-          new_interface = database.GetInterface(new_name)
-          MergeNodes(new_interface, interface)
 
         if rename_javascript_binding_names:
           interface.javascript_binding_name = new_name
           interface.doc_js_name = new_name
           for member in (interface.operations + interface.constants
               + interface.attributes):
             member.doc_js_interface_name = new_name
 
 
     # Fix references:
@@ skipping 291 matching lines @@
         PARAMETERS=constructor_info.ParametersImplementationDeclaration())
 
   def FinishInterface(self):
     pass
 
   def AddTypedArrayConstructors(self, element_type):
     pass
 
   def AddEventAttributes(self, event_attrs):
     pass