Revert r59012 which started using Chrome sockets for sync.

jingle/notifier/base/notifier_options.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef JINGLE_NOTIFIER_BASE_NOTIFIER_OPTIONS_H_
 #define JINGLE_NOTIFIER_BASE_NOTIFIER_OPTIONS_H_
 
 #include "jingle/notifier/base/notification_method.h"
 #include "net/base/host_port_pair.h"
 
 namespace notifier {
 
 struct NotifierOptions {
   NotifierOptions()
-      : try_ssltcp_first(false),
+      : use_chrome_async_socket(true),
+        try_ssltcp_first(false),
         notification_method(kDefaultNotificationMethod) {}
 
-  NotifierOptions(const bool try_ssltcp_first,
+  NotifierOptions(const bool use_chrome_async_socket,
+                  const bool try_ssltcp_first,
                   const net::HostPortPair& xmpp_host_port,
                   NotificationMethod notification_method)
-      : try_ssltcp_first(try_ssltcp_first),
+      : use_chrome_async_socket(use_chrome_async_socket),
+        try_ssltcp_first(try_ssltcp_first),
         xmpp_host_port(xmpp_host_port),
         notification_method(notification_method) {}
 
+  // Indicates whether to use the chrome-socket-based buzz::AsyncSocket
+  // implementation for notifications.
+  bool use_chrome_async_socket;
+
   // Indicates that the SSLTCP port (443) is to be tried before the the XMPP
   // port (5222) during login.
   bool try_ssltcp_first;
 
   // Contains a custom URL and port for the notification server, if one is to
   // be used. Empty otherwise.
   net::HostPortPair xmpp_host_port;
 
   // Indicates the method used by sync clients while sending and listening to
   // notifications.
   NotificationMethod notification_method;
 };
 
 }  // namespace notifier
 
 #endif  // JINGLE_NOTIFIER_BASE_NOTIFIER_OPTIONS_H_