[Chromoting] Make ChromotingHost's dependency on libjingle injected, instead of hard-coded.

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"
+#include "remoting/protocol/session_manager.h"
+
+namespace remoting {
+
+struct NetworkSettings;
+
+scoped_ptr<protocol::SessionManager> CreateHostSessionManager(
+    const NetworkSettings& network_settings,
+    const scoped_refptr<net::URLRequestContextGetter>&
+        url_request_context_getter);
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_SESSION_MANAGER_FACTORY_H_