Refactoring analyzer_cli for code hygiene.

pkg/analyzer_cli/test/super_mixin_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 analyzer_cli.test.super_mixin;
 
 import 'dart:io';
 
+import 'package:analyzer_cli/src/analyzer_driver.dart'
+    show Driver, errorSink, outSink;
 import 'package:analyzer_cli/src/ansi.dart' as ansi;
-import 'package:analyzer_cli/src/driver.dart' show Driver, errorSink, outSink;
 import 'package:path/path.dart' as path;
 import 'package:test/test.dart';
 
 import 'utils.dart';
 
 /// End-to-end test for --supermixins.
 ///
 /// Most super mixin tests are in Analyzer, but this verifies the option is
 /// working and producing extra errors as expected.
 ///
@@ skipping 41 matching lines @@
     test('produces no errors when option present', () async {
       var testPath = path.join(testDirectory, 'data/super_mixin_example.dart');
       await new Driver().start(['--supermixin', testPath]);
 
       expect(exitCode, 0);
       var stdout = outSink.toString();
       expect(stdout, contains('No issues found'));
     });
   });
 }