Deletes remaining traces of gyp in services/ and mojo/

services/shell/public/interfaces/BUILD.gn

 # 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/public/tools/bindings/mojom.gni")
 
-# GYP version: mojo/mojo_base.gyp:mojo_application_bindings
 mojom("interfaces") {
   sources = [
     "capabilities.mojom",
     "connector.mojom",
     "interface_provider.mojom",
     "resolver.mojom",
     "service.mojom",
     "service_factory.mojom",
     "service_manager.mojom",
   ]
 
   public_deps = [
     "//mojo/common:common_custom_types",
   ]
 }