Fix Dartium test break

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 361 matching lines @@
       'transactionList',
   'IDBDatabase.transaction(DOMString storeName, DOMString mode)':
       'transactionStore',
   'RTCDataChannel.send(ArrayBuffer data)': 'sendByteBuffer',
   'RTCDataChannel.send(ArrayBufferView data)': 'sendTypedData',
   'RTCDataChannel.send(Blob data)': 'sendBlob',
   'RTCDataChannel.send(DOMString data)': 'sendString',
   'SourceBuffer.appendBuffer(ArrayBufferView view)': 'appendBufferView',
   'URL.createObjectURL(MediaSource source)':
       'createObjectUrlFromSource',
+  'URL.createObjectURL(WebKitMediaSource source)':
+      '_createObjectUrlFromWebKitSource',
   'URL.createObjectURL(MediaStream stream)': 'createObjectUrlFromStream',
   'URL.createObjectURL(Blob blob)': 'createObjectUrlFromBlob',
   'WebGLRenderingContext.texImage2D(unsigned long target, long level, '
       'unsigned long internalformat, unsigned long format, unsigned long '
       'type, ImageData pixels)': 'texImage2DImageData',
   'WebGLRenderingContext.texImage2D(unsigned long target, long level, '
       'unsigned long internalformat, unsigned long format, unsigned long '
       'type, HTMLImageElement image)': 'texImage2DImage',
   'WebGLRenderingContext.texImage2D(unsigned long target, long level, '
       'unsigned long internalformat, unsigned long format, unsigned long '
@@ skipping 466 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)