Pull in test_reflective_loader 0.0.4 and switch analyzer to it.

pkg/analyzer/test/src/util/absolute_path_test.dart

Index: pkg/analyzer/test/src/util/absolute_path_test.dart
diff --git a/pkg/analyzer/test/src/util/absolute_path_test.dart b/pkg/analyzer/test/src/util/absolute_path_test.dart
index 98b38c52a4b3937ad467d96edb40be743d596b3d..f8be96bc475871cd7ae56a241de2aa45d5f32e1b 100644
--- a/pkg/analyzer/test/src/util/absolute_path_test.dart
+++ b/pkg/analyzer/test/src/util/absolute_path_test.dart
@@ -5,15 +5,15 @@
 library analyzer.test.src.util.absolute_path_test;
 
 import 'package:analyzer/src/util/absolute_path.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'package:unittest/unittest.dart';
 
-import '../../reflective_tests.dart';
 import '../../utils.dart';
 
 main() {
   initializeTestEnvironment();
-  runReflectiveTests(AbsolutePathContextPosixTest);
-  runReflectiveTests(AbsolutePathContextWindowsTest);
+  defineReflectiveTests(AbsolutePathContextPosixTest);
+  defineReflectiveTests(AbsolutePathContextWindowsTest);
 }
 
 @reflectiveTest