Use IpcVideoFrameCapturer on network thread instead of capturer thread.

remoting/host/client_session_unittest.cc

Index: remoting/host/client_session_unittest.cc
diff --git a/remoting/host/client_session_unittest.cc b/remoting/host/client_session_unittest.cc
index dade4725c47d213c20f7787d3a61c566d5a9f08a..3e7eacb0a6547475a7354170e364ceef4d6a22d6 100644
--- a/remoting/host/client_session_unittest.cc
+++ b/remoting/host/client_session_unittest.cc
@@ -188,11 +188,6 @@ void ClientSessionTest::CreateClientSession() {
   client_session_.reset(new ClientSession(
       &session_event_handler_,
       task_runner_,  // Audio thread.
-      task_runner_,  // Input thread.
-      task_runner_,  // Capture thread.
-      task_runner_,  // Encode thread.
-      task_runner_,  // Network thread.
-      task_runner_,  // UI thread.
       std::move(connection), desktop_environment_factory_.get(),
       base::TimeDelta(), nullptr, extensions_));
 }