Add a copy of webrtc's TaskRunner abstraction, which is going to be deleted in webrtc.

jingle/notifier/communicator/login.cc

 // Copyright (c) 2012 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.
 
 #include "jingle/notifier/communicator/login.h"
 
 #include <string>
 
 #include "base/logging.h"
 #include "base/rand_util.h"
 #include "base/time/time.h"
 #include "net/base/host_port_pair.h"
+#include "third_party/libjingle_xmpp/task_runner/taskrunner.h"
 #include "third_party/libjingle_xmpp/xmllite/xmlelement.h"
 #include "third_party/libjingle_xmpp/xmpp/asyncsocket.h"
 #include "third_party/libjingle_xmpp/xmpp/prexmppauth.h"
 #include "third_party/libjingle_xmpp/xmpp/xmppclient.h"
 #include "third_party/libjingle_xmpp/xmpp/xmppclientsettings.h"
 #include "third_party/libjingle_xmpp/xmpp/xmppengine.h"
 #include "webrtc/base/firewallsocketserver.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/physicalsocketserver.h"
-#include "webrtc/base/taskrunner.h"
 
 namespace notifier {
 
 Login::Delegate::~Delegate() {}
 
 Login::Login(Delegate* delegate,
              const buzz::XmppClientSettings& user_settings,
              const scoped_refptr<net::URLRequestContextGetter>&
                 request_context_getter,
              const ServerList& servers,
@@ skipping 102 matching lines @@
   const base::TimeDelta kMaxReconnectInterval =
       base::TimeDelta::FromMinutes(30);
   reconnect_interval_ *= 2;
   if (reconnect_interval_ > kMaxReconnectInterval)
     reconnect_interval_ = kMaxReconnectInterval;
   DVLOG(1) << "Reconnecting...";
   StartConnection();
 }
 
 }  // namespace notifier