Modified unittest to use new argument syntax.

tests/html/util.dart

Index: tests/html/util.dart
===================================================================
--- tests/html/util.dart	(revision 14156)
+++ tests/html/util.dart	(working copy)
@@ -2,14 +2,13 @@
 // 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.
 
-void expectUnsupported(void fn()) =>
-  Expect.throws(fn, (e) => e is UnsupportedError);
+void expectUnsupported(f) => expect(f, throwsUnsupportedError);
 
 void expectEmptyRect(ClientRect rect) {
-  Expect.equals(0, rect.bottom);
-  Expect.equals(0, rect.top);
-  Expect.equals(0, rect.left);
-  Expect.equals(0, rect.right);
-  Expect.equals(0, rect.height);
-  Expect.equals(0, rect.width);
+  expect(rect.bottom, isZero);
+  expect(rect.top, isZero);
+  expect(rect.left, isZero);
+  expect(rect.right, isZero);
+  expect(rect.height, isZero);
+  expect(rect.width, isZero);
 }