Fix code for @failingTest refactoring tests.

pkg/analysis_server/test/services/correction/assist_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.
 
 library test.services.correction.assist;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/edit/assist/assist_core.dart';
 import 'package:analysis_server/plugin/edit/assist/assist_dart.dart';
@@ skipping 4199 matching lines @@
 }
 
 @reflectiveTest
 class AssistProcessorTest_Driver extends AssistProcessorTest {
   @override
   bool get enableNewAnalysisDriver => true;
 
   @failingTest
   @override
   test_addTypeAnnotation_local_OK_addImport_notLibraryUnit() {
-    return test_addTypeAnnotation_local_OK_addImport_notLibraryUnit();
+    return super.test_addTypeAnnotation_local_OK_addImport_notLibraryUnit();
   }
 
   @failingTest
   @override
   test_invalidSelection() {
-    return test_invalidSelection();
+    return super.test_invalidSelection();
   }
 }
 
 class _DartAssistContextForValues implements DartAssistContext {
   @override
   final Source source;
 
   @override
   final int selectionOffset;
 
   @override
   final int selectionLength;
 
   @override
   final AnalysisContext analysisContext;
 
   @override
   final CompilationUnit unit;
 
   _DartAssistContextForValues(this.source, this.selectionOffset,
       this.selectionLength, this.analysisContext, this.unit);
 }