Removes files from //build that we don't need

build/android/ant/BUILD.gn

Index: build/android/ant/BUILD.gn
diff --git a/build/android/ant/BUILD.gn b/build/android/ant/BUILD.gn
deleted file mode 100644
index a30fb54bf4afe369037469b1bb0fef74c17b1c05..0000000000000000000000000000000000000000
--- a/build/android/ant/BUILD.gn
+++ /dev/null
@@ -1,13 +0,0 @@
-# Copyright 2015 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.
-
-copy("keystore") {
-  sources = [
-    "chromium-debug.keystore",
-  ]
-
-  outputs = [
-    "$root_out_dir/chromium-debug.keystore",
-  ]
-}