Update the streams interfaces

runtime/bin/socket_impl.dart

 // Copyright (c) 2011, 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.
 
 /*
  * SocketNativeWrapper is defined in native and holds a field to store the
  * native socket object.
  */
 class _SocketBase {
 
@@ skipping 259 matching lines @@
 
   void setDataHandler(void callback()) {
     _setHandler(_IN_EVENT, callback);
   }
 
   void setCloseHandler(void callback()) {
     _setHandler(_CLOSE_EVENT, callback);
   }
 
   InputStream get inputStream() {
-    if (_inputStream === null) {
+    if (_inputStream == null) {
       _inputStream = new SocketInputStream(this);
     }
     return _inputStream;
   }
 
   OutputStream get outputStream() {
-    if (_outputStream === null) {
+    if (_outputStream == null) {
       _outputStream = new SocketOutputStream(this);
     }
     return _outputStream;
   }
 
   SocketInputStream _inputStream;
   SocketOutputStream _outputStream;
 }