Always use chromium threads for IO in remoting host

remoting/host/register_support_host_request.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 "remoting/host/register_support_host_request.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/string_number_conversions.h"
 #include "base/time.h"
 #include "remoting/base/constants.h"
 #include "remoting/host/host_config.h"
 #include "remoting/jingle_glue/iq_sender.h"
-#include "remoting/jingle_glue/jingle_thread.h"
 #include "remoting/jingle_glue/signal_strategy.h"
 #include "third_party/libjingle/source/talk/xmllite/xmlelement.h"
 #include "third_party/libjingle/source/talk/xmpp/constants.h"
 
 using buzz::QName;
 using buzz::XmlElement;
 
 namespace remoting {
 
 namespace {
@@ skipping 150 matching lines @@
   iq_sender_.reset();
   signal_strategy_->RemoveListener(this);
   signal_strategy_ = NULL;
 
   RegisterCallback callback = callback_;
   callback_.Reset();
   callback.Run(success, support_id, lifetime);
 }
 
 }  // namespace remoting