Fix dart:html generated directory structure and unify file names between backends.

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 160 matching lines @@
     self._system = system
     self._current_secondary_parent = None
     self._html_interface_name = system._renamer.RenameInterface(self._interface)
 
   def HasImplementation(self):
     return not IsPureInterface(self._interface.id)
 
   def ImplementationClassName(self):
     return self._ImplClassName(self._interface.id)
 
-  def FilePathForDartImplementation(self):
-    return os.path.join(self._system._output_dir, 'dart',
-                        '%sImplementation.dart' % self._interface.id)
-
-  def FilePathForDartFactoryProviderImplementation(self):
-    file_name = '%sFactoryProviderImplementation.dart' % self._interface.id
-    return os.path.join(self._system._output_dir, 'dart', file_name)
-
-  def FilePathForDartElementsFactoryProviderImplementation(self):
-    return os.path.join(self._system._output_dir, 'dart',
-                        '_ElementsFactoryProviderImplementation.dart')
-
   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 StartInterface(self):
@@ skipping 751 matching lines @@
     parent_interface = _FindInHierarchy(database, parent_interface, test)
     if parent_interface:
       return parent_interface
 
 def _ToWebKitName(name):
   name = name[0].lower() + name[1:]
   name = re.sub(r'^(hTML|uRL|jS|xML|xSLT)', lambda s: s.group(1).lower(),
                 name)
   return re.sub(r'^(create|exclusive)', lambda s: 'is' + s.group(1).capitalize(),
                 name)