Unused import cleanup.

pkg/analyzer/test/src/task/dart_work_manager_test.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 test.src.task.dart_work_manager_test;
 
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/engine.dart'
     show
         AnalysisErrorInfo,
         AnalysisErrorInfoImpl,
         CacheState,
         ChangeNoticeImpl,
         InternalAnalysisContext;
 import 'package:analyzer/src/generated/error.dart' show AnalysisError;
 import 'package:analyzer/src/generated/java_engine.dart' show CaughtException;
 import 'package:analyzer/src/generated/scanner.dart' show ScannerErrorCode;
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/testing/ast_factory.dart';
 import 'package:analyzer/src/task/dart.dart';
 import 'package:analyzer/src/task/dart_work_manager.dart';
-import 'package:analyzer/src/task/driver.dart';
 import 'package:analyzer/task/dart.dart';
 import 'package:analyzer/task/general.dart';
 import 'package:analyzer/task/model.dart';
 import 'package:typed_mock/typed_mock.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../generated/test_support.dart';
 import '../../reflective_tests.dart';
 import '../../utils.dart';
 
@@ skipping 684 matching lines @@
   }
 
   @override
   ChangeNoticeImpl getNotice(Source source) {
     return _pendingNotices.putIfAbsent(
         source, () => new ChangeNoticeImpl(source));
   }
 
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }