Remove multiple logging implementations.

Change-Id: I7474c29b394f37918a35bba58b2fab58a7be930f
diff --git a/aos/vision/debug/debug_framework.cc b/aos/vision/debug/debug_framework.cc
index 7b3ad76..47e0856 100644
--- a/aos/vision/debug/debug_framework.cc
+++ b/aos/vision/debug/debug_framework.cc
@@ -151,7 +151,7 @@
 void DebugFrameworkMain(int argc, char **argv, FilterHarness *filter,
                         CameraParams camera_params) {
   ::aos::logging::Init();
-  ::aos::logging::AddImplementation(
+  ::aos::logging::SetImplementation(
       new ::aos::logging::StreamLogImplementation(stdout));
 
   gtk_init(&argc, &argv);