Convert more tests to the new driver

pkg/analysis_server/test/analysis/notification_highlights_test2.dart

Index: pkg/analysis_server/test/analysis/notification_highlights_test2.dart
diff --git a/pkg/analysis_server/test/analysis/notification_highlights_test2.dart b/pkg/analysis_server/test/analysis/notification_highlights_test2.dart
index 56de971b1a721ed000b660ecf581137659a1597f..60246e5a8060a0204c3534c53047e2477ba2ab27 100644
--- a/pkg/analysis_server/test/analysis/notification_highlights_test2.dart
+++ b/pkg/analysis_server/test/analysis/notification_highlights_test2.dart
@@ -24,8 +24,7 @@ main() {
 class AnalysisNotificationHighlightsTest extends AbstractAnalysisTest {
   List<HighlightRegion> regions;
 
-  @override
-  bool get enableNewAnalysisDriver => false;
+  Completer _resultsAvailable = new Completer();
 
   void assertHasRawRegion(HighlightRegionType type, int offset, int length) {
     for (HighlightRegion region in regions) {
@@ -93,7 +92,7 @@ class AnalysisNotificationHighlightsTest extends AbstractAnalysisTest {
 
   Future prepareHighlights() {
     addAnalysisSubscription(AnalysisService.HIGHLIGHTS, testFile);
-    return waitForTasksFinished();
+    return _resultsAvailable.future;
   }
 
   void processNotification(Notification notification) {
@@ -101,6 +100,7 @@ class AnalysisNotificationHighlightsTest extends AbstractAnalysisTest {
       var params = new AnalysisHighlightsParams.fromNotification(notification);
       if (params.file == testFile) {
         regions = params.regions;
+        _resultsAvailable.complete(null);
       }
     }
   }