Fixing up element_types_test to work properly in checked mode.

tools/dom/scripts/systemhtml.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.
 
 """This module provides shared functionality for the system to generate
 Dart:html APIs from the IDL database."""
 
 import emitter
 import logging
@@ skipping 149 matching lines @@
     ElementConstructorInfo(tag='img',
                            opt_params=[('DOMString', 'src'),
                                        ('int', 'width'), ('int', 'height')]),
   'HTMLKeygenElement': 'keygen',
   'HTMLLIElement': 'li',
   'HTMLLabelElement': 'label',
   'HTMLLegendElement': 'legend',
   'HTMLLinkElement': 'link',
   'HTMLMapElement': 'map',
   'HTMLMenuElement': 'menu',
+  'HTMLMetaElement': 'meta',
   'HTMLMeterElement': 'meter',
   'HTMLOListElement': 'ol',
   'HTMLObjectElement': 'object',
   'HTMLOptGroupElement': 'optgroup',
   'HTMLOutputElement': 'output',
   'HTMLParagraphElement': 'p',
   'HTMLParamElement': 'param',
   'HTMLPreElement': 'pre',
   'HTMLProgressElement': 'progress',
+  'HTMLQuoteElement': 'q',
   'HTMLScriptElement': 'script',
   'HTMLSelectElement': 'select',
+  'HTMLShadowElement': 'shadow',
   'HTMLSourceElement': 'source',
   'HTMLSpanElement': 'span',
   'HTMLStyleElement': 'style',
   'HTMLTableCaptionElement': 'caption',
   'HTMLTableCellElement': 'td',
   'HTMLTableColElement': 'col',
   'HTMLTableElement': 'table',
   'HTMLTableRowElement': 'tr',
   #'HTMLTableSectionElement'  <thead> <tbody> <tfoot>
   'HTMLTemplateElement': 'template',
@@ skipping 997 matching lines @@
     for library_name in libraries:
       self._libraries[library_name] = DartLibrary(
           library_name, template_loader, library_type, output_dir)
 
   def AddFile(self, basename, library_name, path):
     self._libraries[library_name].AddFile(path)
 
   def Emit(self, emitter, auxiliary_dir):
     for lib in self._libraries.values():
       lib.Emit(emitter, auxiliary_dir)