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

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

 // Copyright (c) 2014, 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.
 
 /**
  * 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';
 
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 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 = '''
 // Do a bunch of imports so that analysis has some work to do.
 import 'dart:io';
 import 'dart:convert';
 import 'dart:async';
 
 main() {}''';
     writeFile(pathname, text);
     standardAnalysisSetup();
     return analysisFinished.then((_) {
       sendAnalysisReanalyze();
       // Wait for reanalysis to start.
       return onServerStatus.first.then((_) {
         sendAnalysisReanalyze();
         return analysisFinished.then((_) {
           // Now that reanalysis has finished, give the server an extra second
           // to make sure it doesn't crash.
           return new Future.delayed(new Duration(seconds: 1));
         });
       });
     });
   }
 }
-
-@reflectiveTest
-class ReanalyzeTest extends AbstractReanalyzeTest {}
-
-@reflectiveTest
-class ReanalyzeTest_Driver extends AbstractReanalyzeTest {
-  @override
-  bool get enableNewAnalysisDriver => true;
-}