Remove multiple logging implementations.

Change-Id: I7474c29b394f37918a35bba58b2fab58a7be930f
diff --git a/y2019/vision/debug_serial.cc b/y2019/vision/debug_serial.cc
index 857f20f..c707d1f 100644
--- a/y2019/vision/debug_serial.cc
+++ b/y2019/vision/debug_serial.cc
@@ -24,7 +24,7 @@
   using namespace frc971::jevois;
   // gflags::ParseCommandLineFlags(&argc, &argv, false);
   ::aos::logging::Init();
-  ::aos::logging::AddImplementation(
+  ::aos::logging::SetImplementation(
       new ::aos::logging::StreamLogImplementation(stderr));
 
   int flags = fcntl(0, F_GETFL, 0);