Fix for build and IDL formats.

pkg/analyzer/lib/src/summary/format.dart

 // Copyright (c) 2015, 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/analyzer/tool/generate_files".
 
 library analyzer.src.summary.format;
 
 import 'flat_buffers.dart' as fb;
@@ skipping 1426 matching lines @@
   List<int> _elementUnits;
   List<int> _elementUnitUris;
   List<UnitIndexBuilder> _units;
   List<String> _uris;
 
   @override
   List<idl.IndexSyntheticElementKind> get elementKinds => _elementKinds ??= <idl.IndexSyntheticElementKind>[];
 
   /**
    * Each item of this list corresponds to a unique referenced element.  It is
-   * the kind of the element.
+   * the kind of the synthetic element.
    */
   void set elementKinds(List<idl.IndexSyntheticElementKind> _value) {
     assert(!_finished);
     _elementKinds = _value;
   }
 
   @override
   List<int> get elementLibraryUris => _elementLibraryUris ??= <int>[];
 
   /**
@@ skipping 5609 matching lines @@
     "propagatedTypeSlot": propagatedTypeSlot,
     "type": type,
     "visibleLength": visibleLength,
     "visibleOffset": visibleOffset,
   };
 
   @override
   String toString() => convert.JSON.encode(toJson());
 }