Make the universe parts into small libraries.

pkg/compiler/lib/src/compiler.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.
 
 library dart2js.compiler_base;
 
 import 'dart:async' show
     EventSink,
     Future;
 
@@ skipping 110 matching lines @@
 import 'tokens/token_constants.dart' as Tokens show
     COMMENT_TOKEN,
     EOF_TOKEN;
 import 'tokens/token_map.dart' show
     TokenMap;
 import 'tree/tree.dart' show
     Node;
 import 'typechecker.dart' show
     TypeCheckerTask;
 import 'types/types.dart' as ti;
+import 'universe/call_structure.dart' show
+    CallStructure;
+import 'universe/selector.dart' show
+    Selector;
 import 'universe/universe.dart' show
-    CallStructure,
-    Selector,
     Universe;
 import 'util/util.dart' show
     Link,
     Setlet;
 import 'world.dart' show
     World;
 
 abstract class Compiler implements DiagnosticListener {
 
   final Stopwatch totalCompileTime = new Stopwatch();
@@ skipping 1686 matching lines @@
 
   @override
   InterfaceType streamType([DartType elementType]) {
     InterfaceType type = streamClass.computeType(compiler);
     if (elementType == null) {
       return streamClass.rawType;
     }
     return type.createInstantiation([elementType]);
   }
 }