Make reference 0 consistent between AST-based and element-based summaries.

pkg/analyzer/lib/src/summary/summarize_elements.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.
 
 library serialization.elements;
 
 import 'dart:convert';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 320 matching lines @@
    * Add all classes, enums, typedefs, executables, and top level variables
    * from the given compilation unit [element] to the compilation unit summary.
    * [unitNum] indicates the ordinal position of this compilation unit in the
    * library.
    */
   void addCompilationUnitElements() {
     unlinkedReferences = <UnlinkedReferenceBuilder>[
       new UnlinkedReferenceBuilder()
     ];
     linkedReferences = <LinkedReferenceBuilder>[
-      new LinkedReferenceBuilder(kind: ReferenceKind.classOrEnum)
+      new LinkedReferenceBuilder(kind: ReferenceKind.unresolved)
     ];
     List<UnlinkedPublicNameBuilder> names = <UnlinkedPublicNameBuilder>[];
     for (PropertyAccessorElement accessor in compilationUnit.accessors) {
       if (accessor.isPublic) {
         names.add(new UnlinkedPublicNameBuilder(
             kind: ReferenceKind.topLevelPropertyAccessor,
             name: accessor.name,
             numTypeParameters: accessor.typeParameters.length));
       }
     }
@@ skipping 1307 matching lines @@
       exportNames.add(new LinkedExportNameBuilder(
           name: name,
           dependency: serializeDependency(dependentLibrary),
           unit: unit,
           kind: kind));
     }
     pb.exportNames = exportNames;
     return pb;
   }
 }