Cleanup GN BUILD files, gni's and imports.

mojo/services/network/public/cpp/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("//build/module_args/mojo.gni")
 import("//third_party/mojo/src/mojo/public/mojo_sdk.gni")
 
 mojo_sdk_source_set("cpp") {
   restrict_external_deps = false
   public_configs = [ "../../../public/build/config:mojo_services" ]
   sources = [
     "udp_socket_wrapper.cc",
     "udp_socket_wrapper.h",
     "web_socket_read_queue.cc",
     "web_socket_read_queue.h",
     "web_socket_write_queue.cc",
     "web_socket_write_queue.h",
   ]
 
   deps = [
     "../interfaces",
     "//base",
     "//mojo/application/public/cpp",
     "//mojo/common",
     "//mojo/environment:chromium",
   ]
 
   mojo_sdk_deps = [
     "mojo/public/c/system",
     "mojo/public/cpp/system",
   ]
 }