Use ChannelMojo between the remoting network and desktop processes.

remoting/host/desktop_session_connector.h

Index: remoting/host/desktop_session_connector.h
diff --git a/remoting/host/desktop_session_connector.h b/remoting/host/desktop_session_connector.h
index 15bcd5b3980ebde670a34001c2506fdf59e821ac..1185e18dca268dd2f373c3d2d6c87ac2463b8cab 100644
--- a/remoting/host/desktop_session_connector.h
+++ b/remoting/host/desktop_session_connector.h
@@ -7,7 +7,7 @@
 
 #include "base/macros.h"
 #include "base/process/process.h"
-#include "ipc/ipc_platform_file.h"
+#include "ipc/ipc_channel_handle.h"
 
 namespace remoting {
 
@@ -46,8 +46,7 @@ class DesktopSessionConnector {
   // desktop process.
   virtual void OnDesktopSessionAgentAttached(
       int terminal_id,
-      base::ProcessHandle desktop_process_handle,
-      IPC::PlatformFileForTransit desktop_pipe) = 0;
+      const IPC::ChannelHandle& desktop_pipe) = 0;
 
   // Notifies the network process that the daemon has disconnected the desktop
   // session from the associated desktop environment.