Prepare to have more than one universe.

dart/lib/compiler/implementation/native_emitter.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 NativeEmitter {
 
   CodeEmitterTask emitter;
   StringBuffer nativeBuffer;
 
   // Classes that participate in dynamic dispatch. These are the
@@ skipping 342 matching lines @@
   }
 
   bool requiresNativeIsCheck(Element element) {
     if (!element.isClass()) return false;
     ClassElement cls = element;
     if (cls.isNative()) return true;
     return isSupertypeOfNativeClass(element);
   }
 
   void emitIsChecks(StringBuffer checkBuffer) {
-    for (Element type in compiler.universe.isChecks) {
+    for (Element type in compiler.codegenWorld.isChecks) {
       if (!requiresNativeIsCheck(type)) continue;
       String name = compiler.namer.operatorIs(type);
       checkBuffer.add("$defPropName(Object.prototype, '$name', ");
       checkBuffer.add('function() { return false; });\n');
     }
   }
 
   void assembleCode(StringBuffer targetBuffer) {
     if (nativeClasses.isEmpty()) return;
     emitDynamicDispatchMetadata();
@@ skipping 11 matching lines @@
     String toStringName = compiler.namer.instanceMethodName(
         null, const SourceString('toString'), 0);
     objectProperties.add("$defPropName(Object.prototype, '$toStringName', ");
     objectProperties.add(
         'function() { return $toStringHelperName(this); });\n');
 
     targetBuffer.add('$defineNativeClassName = $defineNativeClassFunction;\n');
     targetBuffer.add('$objectProperties$nativeBuffer\n');
   }
 }