Revert "Making all DOM types abstract and removing superfluous Dartium constructors."

tools/dom/templates/html/impl/impl_Text.darttemplate

 // 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.
 
 part of $LIBRARYNAME;
 
-$(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
+$(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
   factory $CLASSNAME(String data) => document.$dom_createTextNode(data);
 $!MEMBERS
 
 $if DART2JS
   @Creates('Null')  // Set from Dart code; does not instantiate a native type.
 $endif
   StreamSubscription _textBinding;
 
   @Experimental
   void bind(String name, model, String path) {
@@ skipping 21 matching lines @@
     _textBinding.cancel();
     _textBinding = null;
   }
 
   @Experimental
   void unbindAll() {
     unbind('text');
     super.unbindAll();
   }
 }