Make the universe parts into small libraries.

tests/compiler/dart2js/patch_test.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.
 
 import 'dart:async';
 import 'package:expect/expect.dart';
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/diagnostics/messages.dart' show
     MessageKind;
 import 'package:compiler/src/elements/elements.dart';
 import 'package:compiler/src/elements/modelx.dart';
 import 'package:compiler/src/tree/tree.dart';
 import 'package:compiler/src/types/types.dart';
-import 'package:compiler/src/universe/universe.dart' show
-    CallStructure,
+import 'package:compiler/src/universe/call_structure.dart' show
+    CallStructure;
+import 'package:compiler/src/universe/selector.dart' show
     Selector;
 import 'package:compiler/src/world.dart';
 
 import 'mock_compiler.dart';
 import 'mock_libraries.dart';
 
 Future<Compiler> applyPatch(String script, String patch,
                             {bool analyzeAll: false,
                              bool analyzeOnly: false,
                              bool runCompiler: false,
@@ skipping 996 matching lines @@
     await testPatchNonFunction();
 
     await testPatchAndSelector();
 
     await testEffectiveTarget(); /// bug: ok
 
     await testAnalyzeAllInjectedMembers();
     await testTypecheckPatchedMembers();
   });
 }