Fix the return type of _TypeRefValidator.

pkg/analyzer/test/src/summary/summary_test.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 analyzer.test.src.summary.summary_test;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
@@ skipping 103 matching lines @@
   parser.parseGenericMethods = true;
   CompilationUnit unit = parser.parseCompilationUnit(scanner.tokenize());
   UnlinkedPublicNamespace namespace = new UnlinkedPublicNamespace.fromBuffer(
       public_namespace.computePublicNamespace(unit).toBuffer());
   return namespace;
 }
 
 /**
  * Type of a function that validates an [TypeRef].
  */
-typedef bool _TypeRefValidator(TypeRef unlinkedTypeRef);
+typedef void _TypeRefValidator(TypeRef unlinkedTypeRef);
 
 /**
  * Override of [SummaryTest] which verifies the correctness of the prelinker by
  * creating summaries from the element model, discarding their prelinked
  * information, and then recreating it using the prelinker.
  */
 @reflectiveTest
 class PrelinkerTest extends SummarizeElementsTest {
   final Map<String, UnlinkedPublicNamespace> uriToPublicNamespace =
       <String, UnlinkedPublicNamespace>{};
@@ skipping 3982 matching lines @@
   CompilationUnit _parseText(String text) {
     CharSequenceReader reader = new CharSequenceReader(text);
     Scanner scanner =
         new Scanner(null, reader, AnalysisErrorListener.NULL_LISTENER);
     Token token = scanner.tokenize();
     Parser parser = new Parser(null, AnalysisErrorListener.NULL_LISTENER);
     parser.parseGenericMethods = true;
     return parser.parseCompilationUnit(token);
   }
 }