Cleanup GN BUILD files, gni's and imports.

components/resource_provider/public/cpp/BUILD.gn

 # Copyright 2015 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")
-
 source_set("cpp") {
   sources = [
     "resource_loader.cc",
     "resource_loader.h",
   ]
 
   deps = [
     "../interfaces",
     "//base",
     "//mojo/application/public/cpp",
     "//mojo/application/public/interfaces",
     "//mojo/common",
     "//mojo/platform_handle",
     "//third_party/mojo/src/mojo/public/cpp/bindings",
     "//third_party/mojo/src/mojo/public/cpp/system",
   ]
 }