Switch pkg packages, pub, and dartdoc to use package: imports.

utils/tests/pub/validator_test.dart

 // Copyright (c) 2012, 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 validator_test;
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:json' as json;
 import 'dart:math' as math;
 
-import '../../../pkg/http/lib/http.dart' as http;
-import '../../../pkg/http/lib/testing.dart';
-import '../../../pkg/pathos/lib/path.dart' as path;
-import '../../../pkg/scheduled_test/lib/scheduled_test.dart';
+import 'package:http/http.dart' as http;
+import 'package:http/testing.dart';
+import 'package:pathos/path.dart' as path;
+import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../pub/entrypoint.dart';
 import '../../pub/io.dart';
 import '../../pub/validator.dart';
 import '../../pub/validator/compiled_dartdoc.dart';
 import '../../pub/validator/dependency.dart';
 import '../../pub/validator/directory.dart';
 import '../../pub/validator/lib.dart';
 import '../../pub/validator/license.dart';
 import '../../pub/validator/name.dart';
@@ skipping 549 matching lines @@
     });
 
     integration('has a README with invalid utf-8', () {
       d.dir(appPath, [
         d.binaryFile("README", [192])
       ]).create();
       expectValidationWarning(utf8Readme);
     });
   });
 }