add UNKNOWN_SOURCE error code and remove 2 unused legacy error codes

pkg/analysis_server/lib/src/generated_protocol.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.
 //
 // This file has been automatically generated.  Please do not edit it manually.
 // To regenerate the file, use the script
 // "pkg/analysis_server/tool/spec/generate_files".
 
 part of protocol;
 /**
@@ skipping 9332 matching lines @@
  *   INVALID_PARAMETER
  *   INVALID_REQUEST
  *   NO_INDEX_GENERATED
  *   REFACTORING_REQUEST_CANCELLED
  *   SERVER_ALREADY_STARTED
  *   SERVER_ERROR
  *   SORT_MEMBERS_INVALID_FILE
  *   SORT_MEMBERS_PARSE_ERRORS
  *   UNANALYZED_PRIORITY_FILES
  *   UNKNOWN_REQUEST
+ *   UNKNOWN_SOURCE
  *   UNSUPPORTED_FEATURE
  * }
  */
 class RequestErrorCode implements Enum {
   /**
    * An "analysis.getErrors" or "analysis.getNavigation" request could not be
    * satisfied because the content of the file changed before the requested
    * results could be computed.
    */
   static const CONTENT_MODIFIED = const RequestErrorCode._("CONTENT_MODIFIED");
@@ skipping 80 matching lines @@
    */
   static const UNANALYZED_PRIORITY_FILES = const RequestErrorCode._("UNANALYZED_PRIORITY_FILES");
 
   /**
    * A request was received which the analysis server does not recognize, or
    * cannot handle in its current configuation.
    */
   static const UNKNOWN_REQUEST = const RequestErrorCode._("UNKNOWN_REQUEST");
 
   /**
+   * The analysis server was requested to perform an action on a source that
+   * does not exist.
+   */
+  static const UNKNOWN_SOURCE = const RequestErrorCode._("UNKNOWN_SOURCE");
+
+  /**
    * The analysis server was requested to perform an action which is not
    * supported.
    *
    * This is a legacy error; it will be removed before the API reaches version
    * 1.0.
    */
   static const UNSUPPORTED_FEATURE = const RequestErrorCode._("UNSUPPORTED_FEATURE");
 
   /**
    * A list containing all of the enum values that are defined.
    */
-  static const List<RequestErrorCode> VALUES = const <RequestErrorCode>[CONTENT_MODIFIED, FORMAT_INVALID_FILE, GET_ERRORS_INVALID_FILE, INVALID_EXECUTION_CONTEXT, INVALID_OVERLAY_CHANGE, INVALID_PARAMETER, INVALID_REQUEST, NO_INDEX_GENERATED, REFACTORING_REQUEST_CANCELLED, SERVER_ALREADY_STARTED, SERVER_ERROR, SORT_MEMBERS_INVALID_FILE, SORT_MEMBERS_PARSE_ERRORS, UNANALYZED_PRIORITY_FILES, UNKNOWN_REQUEST, UNSUPPORTED_FEATURE];
+  static const List<RequestErrorCode> VALUES = const <RequestErrorCode>[CONTENT_MODIFIED, FORMAT_INVALID_FILE, GET_ERRORS_INVALID_FILE, INVALID_EXECUTION_CONTEXT, INVALID_OVERLAY_CHANGE, INVALID_PARAMETER, INVALID_REQUEST, NO_INDEX_GENERATED, REFACTORING_REQUEST_CANCELLED, SERVER_ALREADY_STARTED, SERVER_ERROR, SORT_MEMBERS_INVALID_FILE, SORT_MEMBERS_PARSE_ERRORS, UNANALYZED_PRIORITY_FILES, UNKNOWN_REQUEST, UNKNOWN_SOURCE, UNSUPPORTED_FEATURE];
 
   final String name;
 
   const RequestErrorCode._(this.name);
 
   factory RequestErrorCode(String name) {
     switch (name) {
       case "CONTENT_MODIFIED":
         return CONTENT_MODIFIED;
       case "FORMAT_INVALID_FILE":
@@ skipping 17 matching lines @@
       case "SERVER_ERROR":
         return SERVER_ERROR;
       case "SORT_MEMBERS_INVALID_FILE":
         return SORT_MEMBERS_INVALID_FILE;
       case "SORT_MEMBERS_PARSE_ERRORS":
         return SORT_MEMBERS_PARSE_ERRORS;
       case "UNANALYZED_PRIORITY_FILES":
         return UNANALYZED_PRIORITY_FILES;
       case "UNKNOWN_REQUEST":
         return UNKNOWN_REQUEST;
+      case "UNKNOWN_SOURCE":
+        return UNKNOWN_SOURCE;
       case "UNSUPPORTED_FEATURE":
         return UNSUPPORTED_FEATURE;
     }
     throw new Exception('Illegal enum value: $name');
   }
 
   factory RequestErrorCode.fromJson(JsonDecoder jsonDecoder, String jsonPath, Object json) {
     if (json is String) {
       try {
         return new RequestErrorCode(json);
@@ skipping 1828 matching lines @@
     return false;
   }
 
   @override
   int get hashCode {
     int hash = 0;
     hash = _JenkinsSmiHash.combine(hash, newName.hashCode);
     return _JenkinsSmiHash.finish(hash);
   }
 }