Make the universe parts into small libraries.

pkg/compiler/lib/src/js_backend/codegen/glue.dart

 // Copyright (c) 2014, 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 code_generator_dependencies;
 
 import '../js_backend.dart';
 import '../../common/registry.dart' show
     Registry;
 import '../../compiler.dart' show
     Compiler;
 import '../../constants/values.dart';
 import '../../dart_types.dart' show
     DartType,
     TypeVariableType,
     InterfaceType;
 import '../../enqueue.dart' show
     CodegenEnqueuer;
 import '../../elements/elements.dart';
 import '../../js_emitter/js_emitter.dart';
 import '../../js/js.dart' as js;
-import '../../universe/universe.dart' show
+import '../../universe/selector.dart' show
     Selector;
 import '../../world.dart' show
     ClassWorld;
 
 
 /// Encapsulates the dependencies of the function-compiler to the compiler,
 /// backend and emitter.
 // TODO(sigurdm): Should be refactored when we have a better feeling for the
 // interface.
 class Glue {
@@ skipping 229 matching lines @@
   ClassElement get jsMutableArrayClass => _backend.jsMutableArrayClass;
 
   bool isStringClass(ClassElement classElement) =>
       classElement == _backend.jsStringClass ||
       classElement == _compiler.stringClass;
 
   bool isBoolClass(ClassElement classElement) =>
       classElement == _backend.jsBoolClass ||
       classElement == _compiler.boolClass;
 }