Make the universe parts into small libraries.

pkg/compiler/lib/src/native/native.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 native;
 
 import 'dart:collection' show Queue;
 
 import '../common/registry.dart' show
     Registry;
@@ skipping 30 matching lines @@
 import '../resolution/members.dart' show
     ResolverVisitor;
 import '../ssa/ssa.dart';
 import '../tokens/token.dart' show
     BeginGroupToken,
     Token;
 import '../tokens/token_constants.dart' as Tokens show
     EOF_TOKEN,
     STRING_TOKEN;
 import '../tree/tree.dart';
-import '../universe/universe.dart' show SideEffects;
+import '../universe/side_effects.dart' show
+    SideEffects;
 import '../util/util.dart';
 
 part 'behavior.dart';
 part 'enqueue.dart';
 part 'js.dart';
 part 'scanner.dart';
 part 'ssa.dart';
 
 void maybeEnableNative(Compiler compiler,
                        LibraryElementX library) {
@@ skipping 22 matching lines @@
   String quotedName = cls.nativeTagInfo;
   return quotedName.substring(1, quotedName.length - 1).split(',');
 }
 
 List<String> nativeTagsOfClass(ClassElement cls) {
   return nativeTagsOfClassRaw(cls).where((s) => !s.startsWith('!')).toList();
 }
 
 bool nativeTagsForcedNonLeaf(ClassElement cls) =>
     nativeTagsOfClassRaw(cls).contains('!nonleaf');