cleanup of reflector metric code (finish removing unused code)

pkg/util/prometheusclientgo/BUILD

@@ -8,7 +8,6 @@ go_library(
     deps = [
         "//pkg/client/metrics/prometheus:go_default_library",
         "//pkg/util/prometheusclientgo/leaderelection:go_default_library",
-        "//pkg/util/reflector/prometheus:go_default_library",
         "//pkg/util/workqueue/prometheus:go_default_library",
     ],
 )

pkg/util/prometheusclientgo/adapters.go

@@ -20,6 +20,5 @@ package prometheusclientgo
 import (
 	_ "k8s.io/kubernetes/pkg/client/metrics/prometheus"              // for client metric registration
 	_ "k8s.io/kubernetes/pkg/util/prometheusclientgo/leaderelection" // for leader election metric registration
-	_ "k8s.io/kubernetes/pkg/util/reflector/prometheus"              // for reflector metric registration
 	_ "k8s.io/kubernetes/pkg/util/workqueue/prometheus"              // for workqueue metric registration
 )