Convert refactoring tests to use 'await'.

pkg/analysis_server/test/services/refactoring/abstract_rename.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.refactoring.rename;
 
 import 'package:analysis_server/src/protocol.dart' hide Element;
 import 'package:analysis_server/src/services/correction/namespace.dart';
 import 'package:analysis_server/src/services/refactoring/refactoring.dart';
 import 'package:analyzer/src/generated/ast.dart';
@@ skipping 57 matching lines @@
   SourceEdit findEditById(String id) {
     for (SourceFileEdit fileEdit in refactoringChange.edits) {
       for (SourceEdit edit in fileEdit.edits) {
         if (edit.id == id) {
           return edit;
         }
       }
     }
     return null;
   }
-
-//  /**
-//   * Asserts result of applying [change] to [testCode].
-//   */
-//  void assertTestChangeResult(Change change, String expected)
-//      {
-//    assertChangeResult(change, testSource, expected);
-//  }
-//
-//  /**
-//   * Asserts result of applying [change] to [source].
-//   */
-//  void assertChangeResult(Change change, Source source, String expected)
-//       {
-//    SourceChange sourceChange = getSourceChange(compositeChange, source);
-//    assertNotNull("No change for: " + source.toString(), sourceChange);
-//    String sourceResult = getChangeResult(context, source, sourceChange);
-//    assertEquals(expected, sourceResult);
-////    AnalysisContext context = getAnalysisContext();
-////    assertChangeResult(context, compositeChange, source, expected);
-//  }
 }