Revert "Add "contains" method to Collection."

lib/html/src/Isolates.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.
 
 _serialize(var message) {
   return new _JsSerializer().traverse(message);
 }
 
 class _JsSerializer extends _Serializer {
 
@@ skipping 66 matching lines @@
   int _portId;
   _RemoteSendPortSync(this._isolateId, this._portId);
 
   callSync(var message) {
     var serialized = _serialize(message);
     var result = _call(_isolateId, _portId, serialized);
     return _deserialize(result);
   }
 
   static _call(int isolateId, int portId, var message) {
-    var target = 'dart-port-$isolateId-$portId';
+    var target = 'dart-port-$isolateId-$portId'; 
     // TODO(vsm): Make this re-entrant.
     // TODO(vsm): Set this up set once, on the first call.
     var source = '$target-result';
     var result = null;
     var listener = (Event e) {
       result = JSON.parse(_getPortSyncEventData(e));
     };
     window.on[source].add(listener);
     _dispatchEvent(target, [source, message]);
     window.on[source].remove(listener);
@@ skipping 44 matching lines @@
       _portIdCount = 0;
       _portMap = new Map<int, ReceivePortSync>();
     }
     _portId = _portIdCount++;
     _portMap[_portId] = this;
   }
 
   static int get _isolateId {
     // TODO(vsm): Make this coherent with existing isolate code.
     if (_cachedIsolateId == null) {
-      _cachedIsolateId = _getNewIsolateId();
+      _cachedIsolateId = _getNewIsolateId();      
     }
     return _cachedIsolateId;
   }
 
   static String _getListenerName(isolateId, portId) =>
-      'dart-port-$isolateId-$portId';
+      'dart-port-$isolateId-$portId'; 
   String get _listenerName => _getListenerName(_isolateId, _portId);
 
   void receive(callback(var message)) {
     _callback = callback;
     if (_listener === null) {
       _listener = (Event e) {
         var data = JSON.parse(_getPortSyncEventData(e));
         var replyTo = data[0];
         var message = _deserialize(data[1]);
         var result = _callback(message);
@@ skipping 22 matching lines @@
 }
 
 get _isolateId => ReceivePortSync._isolateId;
 
 void _dispatchEvent(String receiver, var message) {
   var event = new CustomEvent(receiver, false, false, JSON.stringify(message));
   window.$dom_dispatchEvent(event);
 }
 
 String _getPortSyncEventData(CustomEvent event) => event.detail;