Change IllegalArgumentException to ArgumentError.

tests/html/xmlelement_test.dart

 // Copyright (c) 2012, 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('XMLElementTest');
 #import('../../pkg/unittest/unittest.dart');
 #import('../../pkg/unittest/html_config.dart');
 #import('dart:html');
 
 main() {
@@ skipping 11 matching lines @@
     group('.xml', () {
       test('with a well-formed document', () {
         final el = makeElement();
         Expect.isTrue(el is XMLElement);
         Expect.equals('foo', el.elements[0].tagName);
         Expect.equals('bar', el.elements[1].tagName);
       });
 
       test('with too many nodes', () {
         Expect.throws(() => new XMLElement.xml("<xml></xml>foo"),
-            (e) => e is IllegalArgumentException);
+            (e) => e is ArgumentError);
       });
 
       test('with a parse error', () {
         Expect.throws(() => new XMLElement.xml("<xml></xml>>"),
-            (e) => e is IllegalArgumentException);
+            (e) => e is ArgumentError);
       });
 
       test('with a PARSERERROR tag', () {
         final el = new XMLElement.xml("<xml><parsererror /></xml>");
         Expect.equals('parsererror', el.elements[0].tagName);
       });
 
       test('has no parent', () =>
           Expect.isNull(new XMLElement.xml('<foo/>').parent));
     });
@@ skipping 519 matching lines @@
     makeElement().rect.then(
       expectAsync1(ElementRect rect) {
         expectEmptyRect(rect.client);
         expectEmptyRect(rect.offset);
         expectEmptyRect(rect.scroll);
         expectEmptyRect(rect.bounding);
         Expect.isTrue(rect.clientRects.isEmpty());
       }));
   });
 }