Suppress new Request type in dart:html

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 31 matching lines @@
     'HTMLElement' : 'HtmlElement',
     'HTMLHtmlElement' : 'HtmlHtmlElement',
     'IDBFactory': 'IdbFactory', # Manual to avoid name conflicts.
     'Key': 'CryptoKey',
     'NamedNodeMap': '_NamedNodeMap',
     'NavigatorUserMediaErrorCallback': '_NavigatorUserMediaErrorCallback',
     'NavigatorUserMediaSuccessCallback': '_NavigatorUserMediaSuccessCallback',
     'NotificationPermissionCallback': '_NotificationPermissionCallback',
     'PositionCallback': '_PositionCallback',
     'PositionErrorCallback': '_PositionErrorCallback',
+    'Request': '_Request',
     'RTCDTMFSender': 'RtcDtmfSender',
     'RTCDTMFToneChangeEvent': 'RtcDtmfToneChangeEvent',
     'RTCErrorCallback': '_RtcErrorCallback',
     'RTCSessionDescriptionCallback': '_RtcSessionDescriptionCallback',
     'SVGDocument': 'SvgDocument', # Manual to avoid name conflicts.
     'SVGElement': 'SvgElement', # Manual to avoid name conflicts.
     'SVGGradientElement': '_GradientElement',
     'SVGSVGElement': 'SvgSvgElement', # Manual to avoid name conflicts.
     'Stream': 'FileStream',
     'StringCallback': '_StringCallback',
@@ skipping 942 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)