Pull in test_reflective_loader 0.0.4 and switch analyzer to it.

pkg/analyzer/test/generated/package_test.dart

 // Copyright (c) 2016, 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.test.generated.package_test;
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/package.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:package_config/packages.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'package:unittest/unittest.dart';
 
-import '../reflective_tests.dart';
 import '../src/context/mock_sdk.dart';
 import '../utils.dart';
 import 'resolver_test_case.dart';
 
 main() {
   initializeTestEnvironment();
-  runReflectiveTests(DependencyFinderTest);
-  runReflectiveTests(PackageDescriptionTest);
-  runReflectiveTests(PackageManagerTest);
+  defineReflectiveTests(DependencyFinderTest);
+  defineReflectiveTests(PackageDescriptionTest);
+  defineReflectiveTests(PackageManagerTest);
 }
 
 /**
  * The name of the pubspec.yaml file.
  */
 const String pubspecName = 'pubspec.yaml';
 
 @reflectiveTest
 class DependencyFinderTest extends ResolverTestCase {
   /**
@@ skipping 249 matching lines @@
 
   @override
   Map<String, Uri> asMap() => map;
 
   @override
   Uri resolve(Uri packageUri, {Uri notFound(Uri packageUri)}) {
     fail('Unexpected invocation of resolve');
     return null;
   }
 }