Rename Universe to WorldBuilder.

tests/compiler/dart2js/analyze_unused_dart2js_test.dart

 // Copyright (c) 2013, 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.
 
 library analyze_unused_dart2js;
 
 import 'package:async_helper/async_helper.dart';
 
 import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/diagnostics/messages.dart';
@@ skipping 21 matching lines @@
     "The method 'error",
     "The method 'visit"
   ],
 
   // Uncalled type predicate.  Keep while related predicates are used.
   "lib/src/ssa/nodes.dart": const ["The method 'isArray' is never called"],
 
   // Serialization code is only used in test.
   "lib/src/serialization/": const ["is never"],
 
-  "lib/src/universe/universe.dart": const [
+  "lib/src/universe/world_builder.dart": const [
     "The method 'getterInvocationsByName' is never called.",
     "The method 'setterInvocationsByName' is never called."
   ],
 };
 
 void main() {
   var uri =
       currentDirectory.resolve('pkg/compiler/lib/src/use_unused_api.dart');
   asyncTest(() => analyze([uri],
       // TODO(johnniwinther): Use [WHITE_LIST] again when
@@ skipping 23 matching lines @@
       if (member.isResolved) {
         compiler.reporter.reportHintMessage(member, MessageKind.GENERIC,
             {'text': "Helper typedef in production code '$member'."});
       }
     }
   }
 
   compiler.libraryLoader.lookupLibrary(helperUri).forEachLocalMember(checkLive);
   return handler.checkResults();
 }