Integrate EXTRACT_METHOD refactoring into the server.

pkg/analysis_server/lib/src/services/refactoring/extract_method.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_method;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart' hide Element;
 import 'package:analysis_server/src/services/correction/name_suggestion.dart';
@@ skipping 442 matching lines @@
   }
 
   /**
    * Returns the selected [Expression] source, with applying new parameter
    * names.
    */
   String _getMethodBodySource() {
     String source = utils.getRangeText(selectionRange);
     // prepare operations to replace variables with parameters
     List<SourceEdit> replaceEdits = [];
-    for (RefactoringMethodParameter parameter in _parametersMap.values) {
+    for (RefactoringMethodParameter parameter in _parameters) {
       List<SourceRange> ranges = _parameterReferencesMap[parameter.id];
       if (ranges != null) {
         for (SourceRange range in ranges) {
           replaceEdits.add(
               new SourceEdit(
                   range.offset - selectionRange.offset,
                   range.length,
                   parameter.name));
         }
       }
@@ skipping 624 matching lines @@
 
 /**
  * Generalized version of some source, in which references to the specific
  * variables are replaced with pattern variables, with back mapping from the
  * pattern to the original variable names.
  */
 class _SourcePattern {
   String patternSource;
   Map<String, String> originalToPatternNames = {};
 }