Run 'Rename Library' refactoring tests with the new analysis driver.

pkg/analysis_server/test/services/refactoring/abstract_refactoring.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;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart'
     show
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   /**
    * Asserts that [refactoringChange] contains a [FileEdit] for the file
    * with the given [path], and it results the [expectedCode].
    */
   void assertFileChangeResult(String path, String expectedCode) {
     // prepare FileEdit
     SourceFileEdit fileEdit = refactoringChange.getFileEdit(path);
     expect(fileEdit, isNotNull, reason: 'No file edit for $path');
     // validate resulting code
     File file = provider.getResource(path);
-    Source source = file.createSource();
-    String ini = context.getContents(source).data;
+    String ini = file.readAsStringSync();
     String actualCode = SourceEdit.applySequence(ini, fileEdit.edits);
     expect(actualCode, expectedCode);
   }
 
   /**
    * Asserts that [refactoringChange] does not contain a [FileEdit] for the file
    * with the given [path].
    */
   void assertNoFileChange(String path) {
     SourceFileEdit fileEdit = refactoringChange.getFileEdit(path);
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   void setUp() {
     super.setUp();
     if (enableNewAnalysisDriver) {
       searchEngine = new SearchEngineImpl2([driver]);
     } else {
       index = createMemoryIndex();
       searchEngine = new SearchEngineImpl(index);
     }
   }
 }