Update the analysis server integration tests to always run on the analysis driver.

pkg/analysis_server/test/integration/analysis/reanalyze_concurrent_test.dart

Index: pkg/analysis_server/test/integration/analysis/reanalyze_concurrent_test.dart
diff --git a/pkg/analysis_server/test/integration/analysis/reanalyze_concurrent_test.dart b/pkg/analysis_server/test/integration/analysis/reanalyze_concurrent_test.dart
index adc698463ff64affb9fc461c3fd0854b76154b98..b11178fed5977f9e3e6468a090f23881b47ba19d 100644
--- a/pkg/analysis_server/test/integration/analysis/reanalyze_concurrent_test.dart
+++ b/pkg/analysis_server/test/integration/analysis/reanalyze_concurrent_test.dart
@@ -4,9 +4,7 @@
 
 /**
  * This test verifies that if reanalysis is performed while reanalysis is in
- * progress, no problems occur.
- *
- * See dartbug.com/21448.
+ * progress, no problems occur (see #21448).
  */
 import 'dart:async';
 
@@ -17,11 +15,11 @@ import '../integration_tests.dart';
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(ReanalyzeTest);
-    defineReflectiveTests(ReanalyzeTest_Driver);
   });
 }
 
-class AbstractReanalyzeTest extends AbstractAnalysisServerIntegrationTest {
+@reflectiveTest
+class ReanalyzeTest extends AbstractAnalysisServerIntegrationTest {
   test_reanalyze_concurrent() {
     String pathname = sourcePath('test.dart');
     String text = '''
@@ -47,12 +45,3 @@ main() {}''';
     });
   }
 }
-
-@reflectiveTest
-class ReanalyzeTest extends AbstractReanalyzeTest {}
-
-@reflectiveTest
-class ReanalyzeTest_Driver extends AbstractReanalyzeTest {
-  @override
-  bool get enableNewAnalysisDriver => true;
-}