Use fields in hidden native DOM classes instead of getters/setters.

client/dom/generated/src/frog/Console.dart

 // 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.
 
 class _ConsoleJs
     // Implement DOMType directly.  Console is sometimes a singleton
     // bag-of-properties without a prototype, so it can't inherit from
     // DOMTypeJs.
     implements Console, DOMType
     native "=(typeof console == 'undefined' ? {} : console)" {
 
-  _MemoryInfoJs get memory() native "return this.memory;";
+  final _MemoryInfoJs memory;
 
-  List get profiles() native "return this.profiles;";
+  final List profiles;
 
   void assertCondition(bool condition) native;
 
   void count() native;
 
   void debug(Object arg) native;
 
   void dir() native;
 
   void dirxml() native;
@@ skipping 24 matching lines @@
 
   void trace(Object arg) native;
 
   void warn(Object arg) native;
 
 
   // Keep these in sync with frog_DOMTypeJs.dart.
   var dartObjectLocalStorage;
   String get typeName() native;
 }