Stop passing arguments to isInstanceOf.

test/backend/platform_selector/parser_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.
 
 import 'package:test/test.dart';
 import 'package:test/src/backend/platform_selector/ast.dart';
 import 'package:test/src/backend/platform_selector/parser.dart';
 
 /// A matcher that asserts that a value is a [ConditionalNode].
-Matcher _isConditionalNode =
-    new isInstanceOf<ConditionalNode>("ConditionalNode");
+Matcher _isConditionalNode = new isInstanceOf<ConditionalNode>();
 
 /// A matcher that asserts that a value is an [OrNode].
-Matcher _isOrNode = new isInstanceOf<OrNode>("OrNode");
+Matcher _isOrNode = new isInstanceOf<OrNode>();
 
 /// A matcher that asserts that a value is an [AndNode].
-Matcher _isAndNode = new isInstanceOf<AndNode>("AndNode");
+Matcher _isAndNode = new isInstanceOf<AndNode>();
 
 /// A matcher that asserts that a value is a [NotNode].
-Matcher _isNotNode = new isInstanceOf<NotNode>("NotNode");
+Matcher _isNotNode = new isInstanceOf<NotNode>();
 
 void main() {
   group("parses a conditional expression", () {
     test("with identifiers", () {
       var node = _parse("  a ? b : c   ");
       expect(node.toString(), equals("a ? b : c"));
 
       expect(node.span.text, equals("a ? b : c"));
       expect(node.span.start.offset, equals(2));
       expect(node.span.end.offset, equals(11));
@@ skipping 227 matching lines @@
     (value) => value is VariableNode && value.name == name,
     'is a variable named "$name"');
 
 void _expectToString(String selector, [String result]) {
   if (result == null) result = selector;
   expect(_toString(selector), equals(result),
       reason: 'Expected toString of "$selector" to be "$result".');
 }
 
 String _toString(String selector) => new Parser(selector).parse().toString();