Fixing up element_types_test to work properly in checked mode.

sdk/lib/html/dart2js/html_dart2js.dart

 /// The Dart HTML library.
 library dart.dom.html;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:_collection-dev' hide Symbol;
 import 'dart:html_common';
 import 'dart:indexed_db';
 import 'dart:isolate';
 import 'dart:json' as json;
@@ skipping 15225 matching lines @@
 }
 // 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.
 
 
 @DocsEditable
 @DomName('HTMLMetaElement')
 class MetaElement extends Element native "HTMLMetaElement" {
 
+  @DomName('HTMLMetaElement.HTMLMetaElement')
+  @DocsEditable
+  factory MetaElement() => document.$dom_createElement("meta");
+
   @DomName('HTMLMetaElement.content')
   @DocsEditable
   String content;
 
   @DomName('HTMLMetaElement.httpEquiv')
   @DocsEditable
   String httpEquiv;
 
   @DomName('HTMLMetaElement.name')
   @DocsEditable
@@ skipping 2938 matching lines @@
 }
 // 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.
 
 
 @DocsEditable
 @DomName('HTMLQuoteElement')
 class QuoteElement extends Element native "HTMLQuoteElement" {
 
+  @DomName('HTMLQuoteElement.HTMLQuoteElement')
+  @DocsEditable
+  factory QuoteElement() => document.$dom_createElement("q");
+
   @DomName('HTMLQuoteElement.cite')
   @DocsEditable
   String cite;
 }
 // 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.
 
 // WARNING: Do not edit - generated code.
 
@@ skipping 1351 matching lines @@
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('HTMLShadowElement')
 @SupportedBrowser(SupportedBrowser.CHROME, '26')
 @Experimental
 // https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#shadow-element
 class ShadowElement extends Element native "HTMLShadowElement" {
 
+  @DomName('HTMLShadowElement.HTMLShadowElement')
+  @DocsEditable
+  factory ShadowElement() => document.$dom_createElement("shadow");
+
   /// Checks if this type is supported on the current platform.
   static bool get supported => Element.isTagSupported('shadow');
 
   @DomName('HTMLShadowElement.olderShadowRoot')
   @DocsEditable
   final ShadowRoot olderShadowRoot;
 
   @DomName('HTMLShadowElement.resetStyleInheritance')
   @DocsEditable
   bool resetStyleInheritance;
@@ skipping 10305 matching lines @@
       _position = nextPosition;
       return true;
     }
     _current = null;
     _position = _array.length;
     return false;
   }
 
   T get current => _current;
 }