Make more use of generated code in analysis server.

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/src/protocol2.dart';
 import 'package:analysis_server/src/services/correction/change.dart';
@@ skipping 78 matching lines @@
   void assertRefactoringStatusOK(RefactoringStatus status) {
     assertRefactoringStatus(status, RefactoringStatusSeverity.OK);
   }
 
   /**
    * Asserts that [refactoringChange] contains a [FileEdit] for [testFile], and
    * it results the [expectedCode].
    */
   void assertTestChangeResult(String expectedCode) {
     // prepare FileEdit
-    FileEdit fileEdit = refactoringChange.getFileEdit(testFile);
+    SourceFileEdit fileEdit = refactoringChange.getFileEdit(testFile);
     expect(fileEdit, isNotNull);
     // validate resulting code
     String actualCode = SourceEdit.applySequence(testCode, fileEdit.edits);
     expect(actualCode, expectedCode);
   }
 
   void indexTestUnit(String code) {
     resolveTestUnit(code);
     index.indexUnit(context, testUnit);
   }
 
   void indexUnit(String file, String code) {
     Source source = addSource(file, code);
     CompilationUnit unit = resolveLibraryUnit(source);
     index.indexUnit(context, unit);
   }
 
   void setUp() {
     super.setUp();
     index = createLocalMemoryIndex();
     searchEngine = new SearchEngineImpl(index);
   }
 }