Remove multiple logging implementations.

Change-Id: I7474c29b394f37918a35bba58b2fab58a7be930f
diff --git a/y2019/image_streamer/image_streamer.cc b/y2019/image_streamer/image_streamer.cc
index 30bea8f..6f8027c 100644
--- a/y2019/image_streamer/image_streamer.cc
+++ b/y2019/image_streamer/image_streamer.cc
@@ -308,7 +308,7 @@
 int main(int argc, char **argv) {
   gflags::ParseCommandLineFlags(&argc, &argv, false);
   ::aos::logging::Init();
-  ::aos::logging::AddImplementation(
+  ::aos::logging::SetImplementation(
       new ::aos::logging::StreamLogImplementation(stderr));
   TCPServer<MjpegDataSocket> tcp_server_(80);
   aos::vision::CameraParams params0;