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

tools/dom/templates/html/dart2js/impl_Console.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.
 
 part of $LIBRARYNAME;
 
 $(ANNOTATIONS)class Console {
-  Console();
 
   static Console _safeConsole = new Console();
 
   bool get _isConsoleDefined => JS('bool', 'typeof console != "undefined"');
 
   @DomName('Console.memory')
   MemoryInfo get memory => _isConsoleDefined ?
       JS('MemoryInfo', 'console.memory') : null;
 
   @DomName('Console.assertCondition')
@@ skipping 66 matching lines @@
 
   @DomName('Console.trace')
   void trace(Object arg) => _isConsoleDefined ?
       JS('void', 'console.trace(#)', arg) : null;
 
   @DomName('Console.warn')
   void warn(Object arg) => _isConsoleDefined ?
       JS('void', 'console.warn(#)', arg) : null;
 $!MEMBERS
 }