Better return types for window.location and window.history

lib/html/scripts/systemhtml.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
 import os
@@ skipping 48 matching lines @@
   'LocalWindow': 'Window',
   'LocalLocation': 'Location',
   'LocalHistory': 'History',
 }
 
 def SecureOutputType(generator, type_name, is_dart_type=False):
   if is_dart_type:
     dart_name = type_name
   else:
     dart_name = generator._DartType(type_name)
-  if dart_name in _secure_base_types:
+  # We only need to secure Window.  Only local History and Location are returned
+  # in generated code.
+  if dart_name == 'LocalWindow':
     return _secure_base_types[dart_name]
   return dart_name
 
 # Information for generating element constructors.
 #
 # TODO(sra): maybe remove all the argument complexity and use cascades.
 #
 #   var c = new CanvasElement(width: 100, height: 70);
 #   var c = new CanvasElement()..width = 100..height = 70;
 #
@@ skipping 1046 matching lines @@
 
     library_emitter = self._multiemitter.FileEmitter(library_file_path)
     library_file_dir = os.path.dirname(library_file_path)
     auxiliary_dir = os.path.relpath(auxiliary_dir, library_file_dir)
     imports_emitter = library_emitter.Emit(
         self._template, AUXILIARY_DIR=massage_path(auxiliary_dir))
     for path in sorted(self._path_to_emitter.keys()):
       relpath = os.path.relpath(path, library_file_dir)
       imports_emitter.Emit(
           "#source('$PATH');\n", PATH=massage_path(relpath))