Fix TaskScheduler initialization in remoting processes.

remoting/host/remoting_me2me_host.cc

Index: remoting/host/remoting_me2me_host.cc
diff --git a/remoting/host/remoting_me2me_host.cc b/remoting/host/remoting_me2me_host.cc
index 66d1a437baa654c1380f6a7b9e2e1657eaaf4911..d4851ad79e8196743f562cc3dec566ac2cf8e258 100644
--- a/remoting/host/remoting_me2me_host.cc
+++ b/remoting/host/remoting_me2me_host.cc
@@ -1670,6 +1670,9 @@ int HostProcessMain() {
   // Run the main (also UI) message loop until the host no longer needs it.
   base::RunLoop().Run();
 
+  // Block until tasks blocking shutdown have completed their execution.
+  base::TaskScheduler::GetInstance()->Shutdown();
+
   return exit_code;
 }