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..c4993b4a308907aa1758e894b0c5bc51cb9a4ea5 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 {
 
@@ -41,13 +41,11 @@ class DesktopSessionConnector {
       const ScreenResolution& resolution) = 0;
 
   // Notifies the network process that |terminal_id| is now attached to
-  // a desktop integration process. |desktop_process_handle| specifies the
-  // process handle. |desktop_pipe| is the client end of the pipe opened by the
-  // desktop process.
+  // a desktop integration process. |desktop_pipe| is the client end of the pipe
+  // opened by the 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.