[infra] Remove refs.cfg

This file is no longer being used.

Change-Id: I148095a690ea4f233b32da151da05613b8acc2a0
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/11300
Reviewed-by: Robbie Iannucci <iannucci@google.com>
Reviewed-by: Petr Hosek <phosek@google.com>

infra/config/refs.cfg

diff --git a/infra/config/refs.cfg b/infra/config/refs.cfg
deleted file mode 100644
index 465672f..0000000
--- a/infra/config/refs.cfg
+++ /dev/null
@@ -1,8 +0,0 @@
-# See RefsCfg message in
-# http://luci-config.appspot.com/schemas/projects:refs.cfg for the
-# documentation of this file format.
-
-refs {
-   name: "refs/heads/master"
-   config_path: "infra/config"
-}