move build_config.bzl to subdirectory
Change-Id: I49f68dd6d761cd78294efe5ec1f2e908aa834d37
diff --git a/polyfills/BUILD b/polyfills/BUILD
index 454685b..beeac1a 100644
--- a/polyfills/BUILD
+++ b/polyfills/BUILD
@@ -1,7 +1,7 @@
# Copyright 2019 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
-load("//:build_config.bzl", "build_config")
+load("//build_config:build_config.bzl", "build_config")
cc_library(
name = "polyfills",