Revert 11715.

samples/third_party/dromaeo/tests/RunnerSuite.dart

 typedef void Test();
 typedef void Operation();
 typedef void Reporter(Map<String, Result> results);
 
 class Suite {
   /**
    * Ctor.
    *  [:_window:] The window of the suite.
    *  [:_name:] The name of the suite.
    */
   Suite(this._window, this._name) :
       _operations = new List<Operation>(),
       _nTests = 0, _nRanTests = 0 {
     starter(MessageEvent event) {
       String command = event.data;
       switch (command) {
         case 'start':
           _run();
           return;
         default:
           _window.alert('[${_name}]: unknown command ${command}');
       }
     };
-    _window.on.message.add(starter);
+    try {
+      // dart:dom_deprecated
+      _window.addEventListener('message', starter, false);
+    } on NoSuchMethodException catch (e) {
+      // dart:html
+      _window.on.message.add(starter);
+    }
   }
 
   /**
    * Adds a preparation step to the suite.
    * [:operation:] The operation to be performed.
    */
   Suite prep(Operation operation){
     return _addOperation(operation);
   }
 
@@ skipping 86 matching lines @@
 
   List<Operation> _operations;
   int _nTests;
   int _nRanTests;
 
   Suite _addOperation(Operation operation) {
     _operations.add(operation);
     return this;
   }
 }