Remove unused API.

dart/tests/compiler/dart2js/analyze_unused_dart2js_test.dart

+// Copyright (c) 2013, 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 analyze_unused_dart2js;
+
+import 'package:async_helper/async_helper.dart';
+
+import '../../../sdk/lib/_internal/compiler/implementation/filenames.dart';
+
+import 'analyze_dart2js_test.dart' as analyze_dart2js;
+
+import 'analyze_helper.dart';
+
+void main() {
+  var uri = currentDirectory.resolve(
+      'sdk/lib/_internal/compiler/implementation/use_unused_api.dart');
+  asyncTest(
+      () => analyze([uri], analyze_dart2js.WHITE_LIST, analyzeAll: false));
+}