pkg/test: Remove unused imports

test/frontend/timeout_test.dart

 // Copyright (c) 2016, 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 'dart:async';
-
-import 'package:test/src/backend/state.dart';
 import 'package:test/test.dart';
 
 void main() {
   group("Timeout.parse", () {
     group('for "none"', () {
       test("successfully parses", () {
         expect(new Timeout.parse("none"), equals(Timeout.none));
       });
 
       test("rejects invalid input", () {
@@ skipping 58 matching lines @@
         expect(() => new Timeout.parse("d"), throwsFormatException);
         expect(() => new Timeout.parse("ad"), throwsFormatException);
         expect(() => new Timeout.parse("1z"), throwsFormatException);
         expect(() => new Timeout.parse("1u"), throwsFormatException);
         expect(() => new Timeout.parse("1d5x"), throwsFormatException);
         expect(() => new Timeout.parse("1d*5m"), throwsFormatException);
       });
     });
   });
 }