Always use chromium threads for IO in remoting host

remoting/host/plugin/host_script_object.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/plugin/host_script_object.h"
 
 #include "base/bind.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/message_loop.h"
@@ skipping 531 matching lines @@
     SetState(kError);
     return;
   }
 
   // Generate a key pair for the Host to use.
   // TODO(wez): Move this to the worker thread.
   host_key_pair_.Generate();
 
   // Create XMPP connection.
   scoped_ptr<SignalStrategy> signal_strategy(
-      new XmppSignalStrategy(host_context_->jingle_thread(), uid,
-                             auth_token, auth_service));
+      new XmppSignalStrategy(host_context_->url_request_context_getter(),
+                             uid, auth_token, auth_service));
 
   // Request registration of the host for support.
   scoped_ptr<RegisterSupportHostRequest> register_request(
       new RegisterSupportHostRequest(
           signal_strategy.get(), &host_key_pair_,
           base::Bind(&HostNPScriptObject::OnReceivedSupportID,
                      base::Unretained(this))));
 
   // Beyond this point nothing can fail, so save the config and request.
   signal_strategy_.reset(signal_strategy.release());
@@ skipping 692 matching lines @@
   return is_good;
 }
 
 void HostNPScriptObject::SetException(const std::string& exception_string) {
   DCHECK(plugin_task_runner_->BelongsToCurrentThread());
   g_npnetscape_funcs->setexception(parent_, exception_string.c_str());
   LOG(INFO) << exception_string;
 }
 
 }  // namespace remoting