Remove an obsolete error from the spec and an obsolete command-line flag

pkg/analysis_server/lib/src/edit/edit_domain.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.
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/edit/assist/assist_core.dart';
 import 'package:analysis_server/plugin/edit/assist/assist_dart.dart';
 import 'package:analysis_server/plugin/edit/fix/fix_core.dart';
 import 'package:analysis_server/plugin/edit/fix/fix_dart.dart';
@@ skipping 485 matching lines @@
     }
     // Do sort.
     MemberSorter sorter = new MemberSorter(code, unit);
     List<SourceEdit> edits = sorter.sort();
     SourceFileEdit fileEdit = new SourceFileEdit(file, fileStamp, edits: edits);
     server.sendResponse(
         new EditSortMembersResult(fileEdit).toResponse(request.id));
   }
 
   Response _getAvailableRefactorings(Request request) {
-    if (searchEngine == null) {
-      return new Response.noIndexGenerated(request);
-    }
     _getAvailableRefactoringsImpl(request);
     return Response.DELAYED_RESPONSE;
   }
 
   Future _getAvailableRefactoringsImpl(Request request) async {
     // prepare parameters
     var params = new EditGetAvailableRefactoringsParams.fromRequest(request);
     String file = params.file;
     int offset = params.offset;
     int length = params.length;
@@ skipping 26 matching lines @@
           }
         }
       }
     }
     // respond
     var result = new EditGetAvailableRefactoringsResult(kinds);
     server.sendResponse(result.toResponse(request.id));
   }
 
   Response _getRefactoring(Request request) {
-    if (searchEngine == null) {
-      return new Response.noIndexGenerated(request);
-    }
     if (refactoringManager.hasPendingRequest) {
       refactoringManager.cancel();
       _newRefactoringManager();
     }
     refactoringManager.getRefactoring(request);
     return Response.DELAYED_RESPONSE;
   }
 
   /**
    * Initializes [refactoringManager] with a new instance.
@@ skipping 514 matching lines @@
     }
     return new RefactoringStatus();
   }
 }
 
 /**
  * [_RefactoringManager] throws instances of this class internally to stop
  * processing in a manager that was reset.
  */
 class _ResetError {}