Make the fuchsia mojo/public repo the source of truth.

mojo/public/cpp/utility/BUILD.gn

Index: mojo/public/cpp/utility/BUILD.gn
diff --git a/mojo/public/cpp/utility/BUILD.gn b/mojo/public/cpp/utility/BUILD.gn
deleted file mode 100644
index 450d4952137fa0894d1fe6f559f21ea45acd4679..0000000000000000000000000000000000000000
--- a/mojo/public/cpp/utility/BUILD.gn
+++ /dev/null
@@ -1,19 +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("../../mojo_sdk.gni")
-
-mojo_sdk_source_set("utility") {
-  sources = [
-    "lib/run_loop.cc",
-    "run_loop.h",
-    "run_loop_handler.h",
-  ]
-
-  mojo_sdk_deps = [
-    "mojo/public/c:system",
-    "mojo/public/cpp/bindings:callback",
-    "mojo/public/cpp/system",
-  ]
-}