Moved remoting::win::MessageWindow to base::win::MessageWindow so that it could be re-used outside …

remoting/host/win/host_service.cc

Index: remoting/host/win/host_service.cc
diff --git a/remoting/host/win/host_service.cc b/remoting/host/win/host_service.cc
index a76eb0569e81cc8ab207b1e97ad4c3fc69336e7e..1e87b3326a5383e3ef84a2c23a4b3f61755d3122 100644
--- a/remoting/host/win/host_service.cc
+++ b/remoting/host/win/host_service.cc
@@ -381,7 +381,7 @@ int HostService::RunInConsole() {
   }
 
   // Create a window for receiving session change notifications.
-  win::MessageWindow window;
+  base::win::MessageWindow window;
   if (!window.Create(this)) {
     LOG_GETLASTERROR(ERROR)
         << "Failed to create the session notification window";