Introduce convenience methods into generated analysis server classes.

pkg/analysis_server/lib/src/services/refactoring/extract_local.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 services.src.refactoring.extract_local;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol2.dart' show SourceEdit;
 import 'package:analysis_server/src/services/correction/change.dart';
@@ skipping 133 matching lines @@
           '${declarationSource}${eol}${prefix}');
       change.addEdit(file, edit);
     }
     // prepare replacement
     String occurrenceReplacement = name;
     if (stringLiteralPart != null) {
       occurrenceReplacement = "\${$name}";
     }
     // replace occurrences with variable reference
     for (SourceRange range in occurrences) {
-      SourceEdit edit = editFromRange(range, occurrenceReplacement);
+      SourceEdit edit = new SourceEdit.range(range, occurrenceReplacement);
       change.addEdit(file, edit);
     }
     // done
     return new Future.value(change);
   }
 
   @override
   bool requiresPreview() => false;
 
   /**
@@ skipping 356 matching lines @@
       Token startToken = nodeTokens[startTokenIndex];
       Token endToken = nodeTokens[endTokenIndex];
       // add occurrence range
       int occuStart = nodeOffset + startToken.offset;
       int occuEnd = nodeOffset + endToken.end;
       SourceRange occuRange = rangeStartEnd(occuStart, occuEnd);
       _addOccurrence(occuRange);
     }
   }
 }