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

remoting/host/jingle_session_manager_factory.h

Index: remoting/host/jingle_session_manager_factory.h
diff --git a/remoting/host/jingle_session_manager_factory.h b/remoting/host/jingle_session_manager_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..25422feeedd56bcd41576cb50631c28f8ef96f51
--- /dev/null
+++ b/remoting/host/jingle_session_manager_factory.h
@@ -0,0 +1,31 @@
+// 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_JINGLE_SESSION_MANAGER_FACTORY_H_
+#define REMOTING_HOST_JINGLE_SESSION_MANAGER_FACTORY_H_
+
+#include "remoting/host/session_manager_factory.h"
+
+namespace remoting {
+
+struct NetworkSettings;
+
+// A SessionManagerFactory that creates Jingle-protocol session managers.
+class JingleSessionManagerFactory : public SessionManagerFactory {
+ public:
+  JingleSessionManagerFactory();
+  virtual ~JingleSessionManagerFactory();
+
+  virtual scoped_ptr<protocol::SessionManager> CreateSessionManager(
+      const NetworkSettings& network_settings,
+      const scoped_refptr<net::URLRequestContextGetter>&
+          url_request_context_getter) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(JingleSessionManagerFactory);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_JINGLE_SESSION_MANAGER_FACTORY_H_