Remove MutationEvent bad entries in both removed list and renamed list

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 79 matching lines @@
   'FileWriterSync', # Workers
   'HTMLAllCollection',
   'HTMLAppletElement',
   'HTMLBaseFontElement',
   'HTMLDirectoryElement',
   'HTMLFontElement',
   'HTMLFrameElement',
   'HTMLFrameSetElement',
   'HTMLMarqueeElement',
   'IDBAny',
-  'MutationEvent',
   'Notation',
   'PagePopupController',
   'RGBColor',
   'RadioNodeList',  # Folded onto NodeList in dart2js.
   'Rect',
   'Response', # TODO: Symbol conflicts with Angular: dartbug.com/20937
   'ServiceWorker',
   'SQLTransactionSync', # Workers
   'SQLTransactionSyncCallback', # Workers
   'SVGAltGlyphDefElement', # Webkit only.
@@ skipping 206 matching lines @@
   'MouseEvent.clientX',
   'MouseEvent.clientY',
   'MouseEvent.movementX',
   'MouseEvent.movementY',
   'MouseEvent.webkitMovementX',
   'MouseEvent.webkitMovementY',
   'MouseEvent.offsetX',
   'MouseEvent.offsetY',
   'MouseEvent.screenX',
   'MouseEvent.screenY',
-  'MutationEvent.initMutationEvent',
   'MutationObserver.observe',
   'Node.attributes',
   'Node.localName',
   'Node.namespaceURI',
   'Node.removeChild',
   'Node.replaceChild',
   'ParentNode.childElementCount',
   'ParentNode.children',
   'ParentNode.firstElementChild',
   'ParentNode.lastElementChild',
@@ skipping 688 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)