Revert 25425 and disable web_socket_ping_test on simulators for now.

sdk/lib/io/websocket.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.
 
 part of dart.io;
 
 /**
  * Web socket status codes used when closing a web socket connection.
  */
 abstract class WebSocketStatus {
@@ skipping 120 matching lines @@
   String get closeReason;
 
   /**
    * Set and get the interval for sending ping signals. If a ping message is not
    * answered by a pong message from the peer, the `WebSocket` is assumed
    * disconnected and the connection is closed with a
    * [WebSocketStatus.GOING_AWAY] close code. When a ping signal is sent, the
    * pong message must be received within [pingInterval].
    *
    * There are never two outstanding pings at any given time, and the next ping
-   * timer starts when either data or a pong message is received.
+   * timer starts when the pong is received.
    *
    * Set the [pingInterval] to `null` to disable sending ping messages.
    *
    * The default value is `null`.
    */
   Duration pingInterval;
 
   /**
    * Closes the web socket connection. Set the optional [code] and [reason]
    * arguments to send close information to the remote peer. If they are
@@ skipping 15 matching lines @@
    */
   Future addStream(Stream stream);
 }
 
 
 class WebSocketException implements IOException {
   const WebSocketException([String this.message = ""]);
   String toString() => "WebSocketException: $message";
   final String message;
 }