Avoid calling GetNamedPipeClientProcessId() which is not available on XP.

remoting/host/win/wts_session_process_launcher.cc

Index: remoting/host/win/wts_session_process_launcher.cc
diff --git a/remoting/host/win/wts_session_process_launcher.cc b/remoting/host/win/wts_session_process_launcher.cc
index e57d37c93e03cd573d8db8ddb0e28543c9353256..42cb702a9d3dfff8b5354045670f579cb312c602 100644
--- a/remoting/host/win/wts_session_process_launcher.cc
+++ b/remoting/host/win/wts_session_process_launcher.cc
@@ -205,16 +205,8 @@ void WtsSessionProcessLauncher::DoKillProcess(DWORD exit_code) {
   }
 }
 
-void WtsSessionProcessLauncher::OnChannelConnected(DWORD peer_pid) {
+void WtsSessionProcessLauncher::OnChannelConnected() {
   DCHECK(main_message_loop_->BelongsToCurrentThread());
-
-  DWORD expected_pid = GetProcessId(worker_process_);
-  if (peer_pid != expected_pid) {
-    LOG(ERROR)
-        << "Unexpected client connected: expected=" << expected_pid
-        << ", actual=" << peer_pid;
-    Stop();
-  }
 }
 
 bool WtsSessionProcessLauncher::OnMessageReceived(const IPC::Message& message) {