infra: Remove no longer used refs.cfg.

R=cwallez@chromium.org, vadimsh@chromium.org

No-Try: true
Change-Id: I43d418c8c52af82f62c7074800160353458dbb7d
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/29422
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
diff --git a/infra/config/global/refs.cfg b/infra/config/global/refs.cfg
deleted file mode 100644
index b287e22..0000000
--- a/infra/config/global/refs.cfg
+++ /dev/null
@@ -1,6 +0,0 @@
-# Refs configuration file. The documentation of the format can be found
-# at https://luci-config.appspot.com/schemas/projects:refs.cfg.
-refs {
-  name: "refs/heads/master"
-  config_path: "infra/config/branch"
-}