Add TransportContext class.

remoting/host/session_manager_factory.h

-// 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.
-
-#ifndef REMOTING_HOST_SESSION_MANAGER_FACTORY_H_
-#define REMOTING_HOST_SESSION_MANAGER_FACTORY_H_
-
-#include "base/memory/scoped_ptr.h"
-#include "net/url_request/url_request_context_getter.h"
-
-namespace net {
-class URLRequestContextGetter;
-}  // namespace net
-
-namespace remoting {
-
-class SignalStrategy;
-
-namespace protocol {
-struct NetworkSettings;
-class SessionManager;
-}  // namespace protocol
-
-scoped_ptr<protocol::SessionManager> CreateHostSessionManager(
-    SignalStrategy* signal_strategy,
-    const protocol::NetworkSettings& network_settings,
-    const scoped_refptr<net::URLRequestContextGetter>&
-        url_request_context_getter);
-
-}  // namespace remoting
-
-#endif  // REMOTING_HOST_SESSION_MANAGER_FACTORY_H_