Remove mojo/go - this is being developed in the mojo repo

mojo/go/BUILD.gn

Index: mojo/go/BUILD.gn
diff --git a/mojo/go/BUILD.gn b/mojo/go/BUILD.gn
deleted file mode 100644
index e1903795f1702cae82a53a6e0f526638078cb158..0000000000000000000000000000000000000000
--- a/mojo/go/BUILD.gn
+++ /dev/null
@@ -1,24 +0,0 @@
-# Copyright 2014 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.
-
-import("//build/go/rules.gni")
-
-group("go") {
-  deps = [
-    ":system_test",
-  ]
-}
-
-go_test_binary("system_test") {
-  sources = [
-    "tests/system_test.go",
-  ]
-  static_library_sources = [
-    "c_embedder/c_embedder.cc",
-    "c_embedder/c_embedder.h",
-  ]
-  deps = [
-    "//mojo/edk/system",
-  ]
-}