Remove pdp_values queue.

Switch to event loops (kinda)

Change-Id: Ia1334871715321f99f12015a771414a236221cb6
diff --git a/y2018/wpilib_interface.cc b/y2018/wpilib_interface.cc
index 6b70ef0..154f9d0 100644
--- a/y2018/wpilib_interface.cc
+++ b/y2018/wpilib_interface.cc
@@ -655,7 +655,7 @@
     ::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);