Minor simplification.

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 827 matching lines @@
   def _AddDirectNativeOperation(self, info, html_name):
     # Do we need a native body?
     if html_name != info.declared_name:
       return_type = self._NarrowOutputType(info.type_name)
 
       operation_emitter = self._members_emitter.Emit('$!SCOPE',
           MODIFIERS='static ' if info.IsStatic() else '',
           TYPE=return_type,
           HTML_NAME=html_name,
           NAME=info.declared_name,
-          PARAMS=info.ParametersDeclaration(
-              lambda type_name: self._NarrowInputType(type_name)))
+          PARAMS=info.ParametersDeclaration(self._NarrowInputType))
 
       operation_emitter.Emit(
           '\n'
           #'  // @native("$NAME")\n;'
           '  $MODIFIERS$TYPE $(HTML_NAME)($PARAMS) native "$NAME";\n')
     else:
       self._members_emitter.Emit(
           '\n'
           '  $MODIFIERS$TYPE $NAME($PARAMS) native;\n',
           MODIFIERS='static ' if info.IsStatic() else '',
           TYPE=self._NarrowOutputType(info.type_name),
           NAME=info.name,
-          PARAMS=info.ParametersDeclaration(
-              lambda type_name: self._NarrowInputType(type_name)))
+          PARAMS=info.ParametersDeclaration(self._NarrowInputType))
 
   def _AddOperationWithConversions(self, info, html_name):
     # Assert all operations have same return type.
     assert len(set([op.type.id for op in info.operations])) == 1
     info = info.CopyAndWidenDefaultParameters()
     output_conversion = self._OutputConversion(info.type_name,
                                                info.declared_name)
     if output_conversion:
       return_type = output_conversion.output_type
       native_return_type = output_conversion.input_type
@@ skipping 240 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))