Make the universe parts into small libraries.

pkg/compiler/lib/src/resolution/constructors.dart

 // Copyright (c) 2015, 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.resolution.constructors;
 import '../compiler.dart' show
     Compiler;
 import '../constants/constructors.dart' show
     GenerativeConstantConstructor,
     RedirectingGenerativeConstantConstructor;
@@ skipping 10 matching lines @@
     ConstructorElementX,
     ErroneousConstructorElementX,
     ErroneousElementX,
     ErroneousFieldElementX,
     FieldElementX,
     InitializingFormalElementX,
     ParameterElementX;
 import '../tree/tree.dart';
 import '../util/util.dart' show
     Link;
-import '../universe/universe.dart' show
-    CallStructure,
+import '../universe/call_structure.dart' show
+    CallStructure;
+import '../universe/selector.dart' show
     Selector;
 
 import 'members.dart' show
     lookupInScope,
     ResolverVisitor;
 import 'registry.dart' show
     ResolutionRegistry;
 import 'resolution_common.dart' show
     CommonResolverVisitor;
 import 'resolution_result.dart';
@@ skipping 677 matching lines @@
       sb.write('type=$type');
     } else if (element != null) {
       sb.write('element=$element');
     } else {
       sb.write('type=$type');
     }
     sb.write(')');
     return sb.toString();
   }
 }