Fixes for review comments.

pkg/front_end/test/src/incremental/file_state_test.dart

 // Copyright (c) 2017, 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 'package:front_end/memory_file_system.dart';
 import 'package:front_end/src/fasta/translate_uri.dart';
 import 'package:front_end/src/incremental/file_state.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
@@ skipping 75 matching lines @@
     FileState cFile = await fsState.getFile(c);
     FileState dFile = await fsState.getFile(d);
 
     expect(dFile.exports, hasLength(3));
     {
       NamespaceExport export_ = dFile.exports[0];
       expect(export_.library, aFile);
       expect(export_.combinators, hasLength(1));
       expect(export_.combinators[0].isShow, isTrue);
       expect(export_.combinators[0].names, unorderedEquals(['A', 'B']));
-      expect(export_.filter('A'), isTrue);
-      expect(export_.filter('B'), isTrue);
-      expect(export_.filter('C'), isFalse);
-      expect(export_.filter('D'), isFalse);
+      expect(export_.isExposed('A'), isTrue);
+      expect(export_.isExposed('B'), isTrue);
+      expect(export_.isExposed('C'), isFalse);
+      expect(export_.isExposed('D'), isFalse);
     }
     {
       NamespaceExport export_ = dFile.exports[1];
       expect(export_.library, bFile);
       expect(export_.combinators, hasLength(1));
       expect(export_.combinators[0].isShow, isFalse);
       expect(export_.combinators[0].names, unorderedEquals(['C', 'D']));
-      expect(export_.filter('A'), isTrue);
-      expect(export_.filter('B'), isTrue);
-      expect(export_.filter('C'), isFalse);
-      expect(export_.filter('D'), isFalse);
+      expect(export_.isExposed('A'), isTrue);
+      expect(export_.isExposed('B'), isTrue);
+      expect(export_.isExposed('C'), isFalse);
+      expect(export_.isExposed('D'), isFalse);
     }
     {
       NamespaceExport export_ = dFile.exports[2];
       expect(export_.library, cFile);
       expect(export_.combinators, hasLength(3));
       expect(export_.combinators[0].isShow, isTrue);
       expect(
           export_.combinators[0].names, unorderedEquals(['A', 'B', 'C', 'D']));
       expect(export_.combinators[1].isShow, isFalse);
       expect(export_.combinators[1].names, unorderedEquals(['C']));
       expect(export_.combinators[2].isShow, isTrue);
       expect(export_.combinators[2].names, unorderedEquals(['A', 'D']));
-      expect(export_.filter('A'), isTrue);
-      expect(export_.filter('B'), isFalse);
-      expect(export_.filter('C'), isFalse);
-      expect(export_.filter('D'), isTrue);
+      expect(export_.isExposed('A'), isTrue);
+      expect(export_.isExposed('B'), isFalse);
+      expect(export_.isExposed('C'), isFalse);
+      expect(export_.isExposed('D'), isTrue);
     }
   }
 
   test_topologicalOrder_cycleBeforeTarget() async {
     var aUri = _writeFileDirectives('/a.dart');
     var bUri = _writeFileDirectives('/b.dart', imports: ['c.dart']);
     var cUri = _writeFileDirectives('/c.dart', imports: ['b.dart']);
     var dUri = _writeFileDirectives('/d.dart', imports: ['a.dart', 'b.dart']);
 
     FileState core = await fsState.getFile(_coreUri);
@@ skipping 67 matching lines @@
   Uri _writeFileDirectives(String path,
       {List<String> imports: const [], List<String> exports: const []}) {
     return writeFile(
         path,
         '''
 ${imports.map((uri) => 'import "$uri";').join('\n')}
 ${exports.map((uri) => 'export "$uri";').join('\n')}
 ''');
   }
 }