Fix for 'Create part' Quick Fix.

pkg/analysis_server/lib/src/services/refactoring/move_file.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.move_file;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol_server.dart' hide Element;
 import 'package:analysis_server/src/services/correction/status.dart';
@@ skipping 74 matching lines @@
   @override
   bool requiresPreview() => false;
 
   /**
    * Computes the URI to use to reference [newFile] from [reference].
    */
   String _computeNewUri(SourceReference reference) {
     String refDir = pathContext.dirname(reference.file);
     // try to keep package: URI
     if (_isPackageReference(reference)) {
-      Source newSource = new NonExistingSource(newFile, UriKind.FILE_URI);
+      Source newSource = new NonExistingSource(
+          newFile, pathos.toUri(newFile), UriKind.FILE_URI);
       Uri restoredUri = context.sourceFactory.restoreUri(newSource);
       if (restoredUri != null) {
         return restoredUri.toString();
       }
     }
     // if no package: URI, prepare relative
     return _getRelativeUri(newFile, refDir);
   }
 
   Future<SourceChange> _createFileChange() async {
@@ skipping 124 matching lines @@
       }
     }
   }
 
   void _updateUriReferences(List<UriReferencedElement> elements) {
     for (UriReferencedElement element in elements) {
       _updateUriReference(element);
     }
   }
 }