Cleanup html events generation.

lib/html/scripts/systemnative.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
 native binding from the IDL database."""
 
 import emitter
 import os
@@ skipping 19 matching lines @@
 
   def SetImplementationEmitter(self, implementation_emitter):
     self._dart_impl_emitter = implementation_emitter
 
   def ImplementsMergedMembers(self):
     # We could not add merged functions to implementation class because
     # underlying c++ object doesn't implement them. Merged functions are
     # generated on merged interface implementation instead.
     return False
 
-  def HasCustomEventImplementation(self, member_name):
-    return False
+  def CustomJSMembers(self):
+    return {}
 
   def GenerateCallback(self, info):
     if IsPureInterface(self._interface.id):
       return
 
     cpp_impl_includes = set()
     cpp_header_handlers_emitter = emitter.Emitter()
     cpp_impl_handlers_emitter = emitter.Emitter()
     class_name = 'Dart%s' % self._interface.id
     for operation in self._interface.operations:
@@ skipping 833 matching lines @@
   def EmitResolver(self, template, output_dir):
     file_path = os.path.join(output_dir, 'DartResolver.cpp')
     includes_emitter, body_emitter = self._emitters.FileEmitter(file_path).Emit(template)
     for header_file in self._headers_list:
       path = os.path.relpath(header_file, output_dir)
       includes_emitter.Emit('#include "$PATH"\n', PATH=path)
       body_emitter.Emit(
           '    if (Dart_NativeFunction func = $CLASS_NAME::resolver(name, argumentCount))\n'
           '        return func;\n',
           CLASS_NAME=os.path.splitext(os.path.basename(path))[0])