Stop passing arguments to isInstanceOf.

test/backend/platform_selector/parser_test.dart

Index: test/backend/platform_selector/parser_test.dart
diff --git a/test/backend/platform_selector/parser_test.dart b/test/backend/platform_selector/parser_test.dart
index bc0df398a3c137d7a2660b9989ebbe7ba811c633..04f356c6e631d07caded9806417c525e7e149f53 100644
--- a/test/backend/platform_selector/parser_test.dart
+++ b/test/backend/platform_selector/parser_test.dart
@@ -7,17 +7,16 @@ 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", () {