Add webgl constants back to correct class

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 108 matching lines @@
   'SVGFontFaceUriElement',
   'SVGGlyphElement',
   'SVGGlyphRefElement',
   'SVGHKernElement',
   'SVGMPathElement',
   'SVGPaint',
   'SVGMissingGlyphElement',
   'SVGTRefElement',
   'SVGVKernElement',
   'SubtleCrypto',
+  'WebGLRenderingContextBase',
   'WebKitCSSFilterValue',
   'WebKitCSSMatrix',
   'WebKitCSSMixFunctionValue',
   'WebKitCSSTransformValue',
   'WebKitMediaSource',
   'WebKitNotification',
   'WebKitSourceBuffer',
   'WebKitSourceBufferList',
   'WorkerLocation', # Workers
   'WorkerNavigator', # Workers
@@ skipping 862 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)