Remove GN build file.
diff --git a/BUILD.gn b/BUILD.gn
deleted file mode 100644
index 951b219..0000000
--- a/BUILD.gn
+++ /dev/null
@@ -1,11 +0,0 @@
-# Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
-# for details. All rights reserved. Use of this source code is governed by a
-# BSD-style license that can be found in the LICENSE file.
-
-import("//build/dart/dart_package.gni")
-
-dart_package("func") {
-  package_name = "func"
-
-  disable_analysis = true
-}