Refactoring analyzer_cli for code hygiene.

pkg/analyzer_cli/test/errors_reported_once_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 'dart:io';
 
-import 'package:analyzer_cli/src/driver.dart';
-import 'package:analyzer_cli/src/options.dart';
+import 'package:analyzer_cli/src/analyzer_driver.dart';
+import 'package:analyzer_cli/src/analyzer_options.dart';
 import 'package:path/path.dart' as path;
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'utils.dart';
 
 main() {
   defineReflectiveTests(ErrorsReportedOnceTest);
 }
 
@@ skipping 28 matching lines @@
 
     expect(exitCode, 0);
 
     // Ensure that we only have one copy of the error.
     final String unusedWarning = 'Unused import';
     String output = outSink.toString();
     expect(output, contains(unusedWarning));
     expect(unusedWarning.allMatches(output).toList(), hasLength(1));
   }
 }