More strong mode fixes for analyzer

pkg/analyzer/test/src/dart/ast/utilities_test.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 analyzer.test.src.dart.ast.utilities_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
@@ skipping 402 matching lines @@
   void test_searchWithin_offsetBeforeNode() {
     CompilationUnit unit = ParserTestCase.parseCompilationUnit(r'''
 class A {}
 class B {}''');
     NodeLocator locator = new NodeLocator(0, 0);
     AstNode node = locator.searchWithin(unit.declarations[1]);
     expect(node, isNull);
   }
 
   void _assertLocate(CompilationUnit unit, int start, int end,
-      Predicate<AstNode> predicate, Type expectedClass) {
+      Predicate<Object> predicate, Type expectedClass) {
     NodeLocator locator = new NodeLocator(start, end);
     AstNode node = locator.searchWithin(unit);
     expect(node, isNotNull);
     expect(locator.foundNode, same(node));
     expect(node.offset <= start, isTrue, reason: "Node starts after range");
     expect(node.offset + node.length > end, isTrue,
         reason: "Node ends before range");
     EngineTestCase.assertInstanceOf(predicate, expectedClass, node);
   }
 }
@@ skipping 2886 matching lines @@
    * @param expectedSource the source string that the visitor is expected to produce
    * @param node the AST node being visited to produce the actual source
    * @throws AFE if the visitor does not produce the expected source for the given node
    */
   void _assertSource(String expectedSource, AstNode node) {
     PrintStringWriter writer = new PrintStringWriter();
     node.accept(new ToSourceVisitor(writer));
     expect(writer.toString(), expectedSource);
   }
 }