Privatize host_port.h; was not used in any wrapped language implementation
diff --git a/BUILD b/BUILD
index 0a8be79..6c801e2 100644
--- a/BUILD
+++ b/BUILD
@@ -69,7 +69,6 @@
     "include/grpc/support/avl.h",
     "include/grpc/support/cmdline.h",
     "include/grpc/support/cpu.h",
-    "include/grpc/support/host_port.h",
     "include/grpc/support/log.h",
     "include/grpc/support/log_windows.h",
     "include/grpc/support/port_platform.h",
@@ -502,6 +501,7 @@
         "src/core/lib/gpr/arena.h",
         "src/core/lib/gpr/env.h",
         "src/core/lib/gpr/fork.h",
+        "src/core/lib/gpr/host_port.h",
         "src/core/lib/gpr/mpscq.h",
         "src/core/lib/gpr/murmur_hash.h",
         "src/core/lib/gpr/spinlock.h",