Fix js_test on IE9

tests/html/js_test.dart

 // Copyright (c) 2013, 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 jsTest;
 
 import 'dart:async';
 import 'dart:html';
 import 'dart:typed_data' show ByteBuffer, Int32List;
 import 'dart:indexed_db' show IdbFactory, KeyRange;
@@ skipping 136 matching lines @@
   return result['value'];
 }
 
 function addTestProperty(o) {
   o.testProperty = "test";
 }
 
 function fireClickEvent(w) {
   var event = w.document.createEvent('Events');
   event.initEvent('click', true, false);
-  w.document.body.dispatchEvent(event);
+  w.document.dispatchEvent(event);
 }
 
 function Bar() {
   return "ret_value";
 }
 Bar.foo = "property_value";
 
 function Baz(p1,p2,p3,p4,p5,p6,p7,p8,p9,p10,p11) {
   this.f1 = p1;
   this.f2 = p2;
@@ skipping 821 matching lines @@
           // is lost when typed arrays are passed between JS and Dart.
           // expect(context.callMethod('isPropertyInstanceOf', ['o', listType]),
           //    isTrue);
           context.deleteProperty('o');
         }
       });
 
     });
   });
 }