Fix MouseEvent.movement to not use old webkit prefix

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 302 matching lines @@
   'KeyboardEvent.initKeyboardEvent',
   'KeyboardEvent.keyIdentifier',
   'MediaKeys.createSession',
   'MediaKeySession.update',
   'MessageEvent.initMessageEvent',
   'MouseEvent.initMouseEvent',
   'MouseEvent.clientX',
   'MouseEvent.clientY',
   'MouseEvent.movementX',
   'MouseEvent.movementY',
-  'MouseEvent.webkitMovementX',
-  'MouseEvent.webkitMovementY',
   'MouseEvent.offsetX',
   'MouseEvent.offsetY',
   'MouseEvent.screenX',
   'MouseEvent.screenY',
   'MutationObserver.observe',
   'Node.attributes',
   'Node.localName',
   'Node.namespaceURI',
   'Node.removeChild',
   'Node.replaceChild',
@@ skipping 428 matching lines @@
     'HTMLUListElement.compact',
     'HTMLUListElement.type',
     'IDBDatabase.transaction', # We do this in a template without the generated implementation at all.
     'KeyboardEvent.charCode',
     'KeyboardEvent.keyCode',
     'KeyboardEvent.which',
     'Location.valueOf',
     'MessageEvent.data',
     'MessageEvent.ports',
     'MessageEvent.webkitInitMessageEvent',
+    'MouseEvent.webkitMovementX',
+    'MouseEvent.webkitMovementY',
     'MouseEvent.x',
     'MouseEvent.y',
     'Navigator.registerServiceWorker',
     'Navigator.unregisterServiceWorker',
     'Navigator.isProtocolHandlerRegistered',
     'Navigator.unregisterProtocolHandler',
     'Node.compareDocumentPosition',
     'Node.get:DOCUMENT_POSITION_CONTAINED_BY',
     'Node.get:DOCUMENT_POSITION_CONTAINS',
     'Node.get:DOCUMENT_POSITION_DISCONNECTED',
@@ skipping 245 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)