Remove more classes and members by making them private.

tools/dom/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 62 matching lines @@
   'ArrayBuffer': "JS('bool', 'typeof window.ArrayBuffer != \"undefined\"')",
   'DOMApplicationCache': "JS('bool', '!!(window.applicationCache)')",
   'DOMFileSystem': "JS('bool', '!!(window.webkitRequestFileSystem)')",
   'HTMLContentElement': "Element.isTagSupported('content')",
   'HTMLDataListElement': "Element.isTagSupported('datalist')",
   'HTMLDetailsElement': "Element.isTagSupported('details')",
   'HTMLEmbedElement': "Element.isTagSupported('embed')",
   # IE creates keygen as Block elements
   'HTMLKeygenElement': "Element.isTagSupported('keygen') "
       "&& (new Element.tag('keygen') is KeygenElement)",
-  'HTMLMarqueeElement': "Element.isTagSupported('marquee')"
-      "&& (new Element.tag('marquee') is MarqueeElement)",
   'HTMLMeterElement': "Element.isTagSupported('meter')",
   'HTMLObjectElement': "Element.isTagSupported('object')",
   'HTMLOutputElement': "Element.isTagSupported('output')",
   'HTMLProgressElement': "Element.isTagSupported('progress')",
   'HTMLShadowElement': "Element.isTagSupported('shadow')",
   'HTMLTrackElement': "Element.isTagSupported('track')",
   'NotificationCenter': "JS('bool', '!!(window.webkitNotifications)')",
   'Performance': "JS('bool', '!!(window.performance)')",
   'WebSocket': "JS('bool', 'typeof window.WebSocket != \"undefined\"')",
 }
@@ skipping 953 matching lines @@
     for library_name in libraries:
       self._libraries[library_name] = DartLibrary(
           library_name, template_loader, library_type, output_dir)
 
   def AddFile(self, basename, library_name, path):
     self._libraries[library_name].AddFile(path)
 
   def Emit(self, emitter, auxiliary_dir):
     for lib in self._libraries.values():
       lib.Emit(emitter, auxiliary_dir)