Move pub into sdk/lib/_internal.

sdk/lib/_internal/pub/test/validator/dependency_test.dart

 // Copyright (c) 2013, 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 'dart:json' as json;
 
 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/validator.dart';
-import '../../../pub/validator/dependency.dart';
+import '../../lib/src/entrypoint.dart';
+import '../../lib/src/validator.dart';
+import '../../lib/src/validator/dependency.dart';
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';
 
 Validator dependency(Entrypoint entrypoint) =>
   new DependencyValidator(entrypoint);
 
 expectDependencyValidationError(String error) {
   expect(schedulePackageValidation(dependency),
       completion(pairOf(someElement(contains(error)), isEmpty)));
@@ skipping 215 matching lines @@
       d.dir(appPath, [
         d.libPubspec("test_pkg", "1.0.0", deps: [
           {'hosted': {'name': 'test_pkg', 'version': '>=1.0.0'}}
         ])
       ]).create();
 
       expectValidationWarning(dependency);
     });
   });
 }