Remove old feature for generating canned native bodies.

lib/dom/scripts/systemdart2js.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 systems to generate
 dart2js binding from the IDL database."""
 
 import os
 from generator import *
@@ skipping 359 matching lines @@
       info: An OperationInfo object.
     """
     # TODO(vsm): Handle overloads.
     params = info.ParametersImplementationDeclaration(
         lambda type_name: self._NarrowInputType(type_name))
 
     native_string = ''
     if info.declared_name != info.name:
       native_string = " '%s'" % info.declared_name
 
-    native_body = dom_dart2js_native_bodies.get(
-        self._interface.id + '.' + info.name, '')
-    if native_body:
-      native_string = " '''" + native_body + "'''"
-
     self._members_emitter.Emit(
         '\n'
         '  $TYPE $NAME($PARAMS) native$NATIVESTRING;\n',
         TYPE=self._NarrowOutputType(info.type_name),
         NAME=info.name,
         PARAMS=params,
         NATIVESTRING=native_string)