Remove pdp_values queue.

Switch to event loops (kinda)

Change-Id: Ia1334871715321f99f12015a771414a236221cb6
diff --git a/y2019/wpilib_interface.cc b/y2019/wpilib_interface.cc
index b910a7f..e08b4b1 100644
--- a/y2019/wpilib_interface.cc
+++ b/y2019/wpilib_interface.cc
@@ -685,7 +685,7 @@
     ::frc971::wpilib::JoystickSender joystick_sender(&event_loop);
     ::std::thread joystick_thread(::std::ref(joystick_sender));
 
-    ::frc971::wpilib::PDPFetcher pdp_fetcher;
+    ::frc971::wpilib::PDPFetcher pdp_fetcher(&event_loop);
     ::std::thread pdp_fetcher_thread(::std::ref(pdp_fetcher));
     SensorReader reader(&event_loop);