[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 "remoting/protocol/session_manager.h"
+
+namespace net {
+class URLRequestContextGetter;
+}  // namespace net
+
+namespace remoting {
+
+struct NetworkSettings;
+
+class SessionManagerFactory {
+ public:
+  virtual ~SessionManagerFactory() {};
+
+  virtual scoped_ptr<protocol::SessionManager> CreateSessionManager(
+      const NetworkSettings& network_settings,
+      const scoped_refptr<net::URLRequestContextGetter>&
+          url_request_context_getter) = 0;
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_SESSION_MANAGER_FACTORY_H_