Fix DataView constructor and byte accessors.

lib/dom/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 237 matching lines @@
     self._cpp_resolver_emitter.Emit(
         '    if (name == "$(INTERFACE_NAME)_constructor_Callback")\n'
         '        return Dart$(INTERFACE_NAME)Internal::constructorCallback;\n',
         INTERFACE_NAME=self._interface.id)
 
 
     constructor_info = AnalyzeConstructor(self._interface)
     if constructor_info:
       self._EmitFactoryProvider(self._interface.id, constructor_info)
 
-    if constructor_info is None:
+    if 'CustomConstructor' in self._interface.ext_attrs:
       # We have a custom implementation for it.
       self._cpp_declarations_emitter.Emit(
           '\n'
           'void constructorCallback(Dart_NativeArguments);\n')
       return
 
     raises_dom_exceptions = 'ConstructorRaisesException' in self._interface.ext_attrs
     raises_exceptions = raises_dom_exceptions or len(constructor_info.idl_args) > 0
     arguments = []
     parameter_definitions_emitter = emitter.Emitter()
@@ skipping 781 matching lines @@
       continue
     parent_interface = database.GetInterface(parent.type.id)
     if callback(parent_interface):
       return parent_interface
     parent_interface = _FindParent(parent_interface, database, callback)
     if parent_interface:
       return parent_interface
 
 def _IsArgumentOptionalInWebCore(argument):
   return IsOptional(argument) and not 'Callback' in argument.ext_attrs