Use IpcVideoFrameCapturer on network thread instead of capturer thread.

remoting/host/client_session.h

Index: remoting/host/client_session.h
diff --git a/remoting/host/client_session.h b/remoting/host/client_session.h
index 750a8af797122abede470f4133e0d13465e40c26..039659193ffea702587e55e9d503bd9f41e067bf 100644
--- a/remoting/host/client_session.h
+++ b/remoting/host/client_session.h
@@ -86,19 +86,13 @@ class ClientSession
 
   // |event_handler| and |desktop_environment_factory| must outlive |this|.
   // All |HostExtension|s in |extensions| must outlive |this|.
-  ClientSession(
-      EventHandler* event_handler,
-      scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> input_task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> video_capture_task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> video_encode_task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> network_task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
-      scoped_ptr<protocol::ConnectionToClient> connection,
-      DesktopEnvironmentFactory* desktop_environment_factory,
-      const base::TimeDelta& max_duration,
-      scoped_refptr<protocol::PairingRegistry> pairing_registry,
-      const std::vector<HostExtension*>& extensions);
+  ClientSession(EventHandler* event_handler,
+                scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner,
+                scoped_ptr<protocol::ConnectionToClient> connection,
+                DesktopEnvironmentFactory* desktop_environment_factory,
+                const base::TimeDelta& max_duration,
+                scoped_refptr<protocol::PairingRegistry> pairing_registry,
+                const std::vector<HostExtension*>& extensions);
   ~ClientSession() override;
 
   // Returns the set of capabilities negotiated between client and host.
@@ -203,11 +197,6 @@ class ClientSession
   base::OneShotTimer max_duration_timer_;
 
   scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner_;
-  scoped_refptr<base::SingleThreadTaskRunner> input_task_runner_;
-  scoped_refptr<base::SingleThreadTaskRunner> video_capture_task_runner_;
-  scoped_refptr<base::SingleThreadTaskRunner> video_encode_task_runner_;
-  scoped_refptr<base::SingleThreadTaskRunner> network_task_runner_;
-  scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
 
   // Objects responsible for sending video, audio and mouse shape.
   // |video_stream_| and |mouse_shape_pump_| may be nullptr if the video