Revert "Don't call _ensureRequestAnimationFrame in Dartium."

tools/dom/scripts/htmlrenamer.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.
 import logging
 import monitored
 import re
 
 typed_array_renames = {
     'ArrayBuffer': 'ByteBuffer',
@@ skipping 384 matching lines @@
   'Window.scrollY',
   'Window.pageXOffset',
   'Window.pageYOffset',
 
   'WindowTimers.clearInterval',
   'WindowTimers.clearTimeout',
   'WindowTimers.setInterval',
   'WindowTimers.setTimeout',
   'Window.moveTo',
   'Window.requestAnimationFrame',
-  'Window.cancelAnimationFrame',
   'Window.setInterval',
   'Window.setTimeout',
 ])
 
 # Members from the standard dom that exist in the dart:html library with
 # identical functionality but with cleaner names.
 renamed_html_members = monitored.Dict('htmlrenamer.renamed_html_members', {
     'ConsoleBase.assert': 'assertCondition',
     'CSSKeyframesRule.insertRule': 'appendRule',
     'DirectoryEntry.getDirectory': '_getDirectory',
@@ skipping 615 matching lines @@
 
     # We're looking for a sequence of letters which start with capital letter
     # then a series of caps and finishes with either the end of the string or
     # a capital letter.
     # The [0-9] check is for names such as 2D or 3D
     # The following test cases should match as:
     #   WebKitCSSFilterValue: WebKit(C)(SS)(F)ilterValue
     #   XPathNSResolver: (X)()(P)ath(N)(S)(R)esolver (no change)
     #   IFrameElement: (I)()(F)rameElement (no change)
     return re.sub(r'([A-Z])([A-Z]{2,})([A-Z]|$)', toLower, name)