Make sure that classes in dart:html do not implement both List and List<E>.

tools/dom/scripts/htmldartgenerator.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 the system to generate
 dart:html APIs from the IDL database."""
 
 import emitter
 from generator import AnalyzeOperation, ConstantOutputOrder, \
@@ skipping 427 matching lines @@
         operations[0].type.id == 'void',
         declaration,
         GenerateCall,
         IsOptional,
         can_omit_type_check)
 
   def AdditionalImplementedInterfaces(self):
     # TODO: Include all implemented interfaces, including other Lists.
     implements = []
     if self._interface_type_info.list_item_type():
-      item_type_info = self._type_registry.TypeInfo(
-          self._interface_type_info.list_item_type())
-      implements.append('List')
+      item_type = self._type_registry.TypeInfo(
+          self._interface_type_info.list_item_type()).dart_type()
+      implements.append('List<%s>' % item_type)
     return implements
 
   def Mixins(self):
     mixins = []
     if self._interface_type_info.list_item_type():
       item_type = self._type_registry.TypeInfo(
           self._interface_type_info.list_item_type()).dart_type()
       mixins.append('ListMixin<%s>' % item_type)
       mixins.append('ImmutableListMixin<%s>' % item_type)
 
@@ skipping 240 matching lines @@
 
   def SecureBaseName(self, type_name):
     if type_name in _secure_base_types:
       return _secure_base_types[type_name]
 
   def _DartType(self, type_name):
     return self._type_registry.DartType(type_name)
 
   def _TypeInfo(self, type_name):
     return self._type_registry.TypeInfo(type_name)