Remove global .frc971.control_loops.drivetrain_queue object

Change-Id: I424f09dcc8bc210e49cbdc805d1a423a72332617
diff --git a/y2018/wpilib_interface.cc b/y2018/wpilib_interface.cc
index 16c95c8..903301e 100644
--- a/y2018/wpilib_interface.cc
+++ b/y2018/wpilib_interface.cc
@@ -56,7 +56,6 @@
 #define M_PI 3.14159265358979323846
 #endif
 
-using ::frc971::control_loops::drivetrain_queue;
 using ::y2018::control_loops::SuperstructureQueue;
 using ::y2018::constants::Values;
 using ::aos::monotonic_clock;
@@ -148,7 +147,11 @@
       : ::frc971::wpilib::SensorReader(event_loop),
         superstructure_position_sender_(
             event_loop->MakeSender<SuperstructureQueue::Position>(
-                ".y2018.control_loops.superstructure_queue.position")) {
+                ".y2018.control_loops.superstructure_queue.position")),
+        drivetrain_position_sender_(
+            event_loop->MakeSender<
+                ::frc971::control_loops::DrivetrainQueue::Position>(
+                ".frc971.control_loops.drivetrain_queue.position")) {
     // Set to filter out anything shorter than 1/4 of the minimum pulse width
     // we should ever see.
     UpdateFastEncoderFilterHz(kMaxFastEncoderPulsesPerSecond);
@@ -269,7 +272,7 @@
 
   void RunIteration() {
     {
-      auto drivetrain_message = drivetrain_queue.position.MakeMessage();
+      auto drivetrain_message = drivetrain_position_sender_.MakeMessage();
       drivetrain_message->left_encoder =
           drivetrain_translate(drivetrain_left_encoder_->GetRaw());
       drivetrain_message->left_speed =
@@ -344,6 +347,8 @@
 
  private:
   ::aos::Sender<SuperstructureQueue::Position> superstructure_position_sender_;
+  ::aos::Sender<::frc971::control_loops::DrivetrainQueue::Position>
+      drivetrain_position_sender_;
 
   ::std::unique_ptr<frc::AnalogInput> left_drivetrain_shifter_,
       right_drivetrain_shifter_;