PNaCl cleanup: Remove TempFile class and use base::File instead

components/nacl/renderer/plugin/BUILD.gn

 # Copyright (c) 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.
 
 source_set("nacl_trusted_plugin") {
   sources = [
     "module_ppapi.cc",
     "nacl_subprocess.cc",
     "plugin.cc",
     "pnacl_coordinator.cc",
     "pnacl_resources.cc",
     "pnacl_translate_thread.cc",
     "ppapi_entrypoints.cc",
     "service_runtime.cc",
-    "temporary_file.cc",
     "utility.cc",
   ]
 
   deps = [
     "//base",
     "//content/public/common",
     "//media:shared_memory_support",
     "//native_client/src/shared/gio",
     "//native_client/src/shared/imc",
     "//native_client/src/shared/platform",
     "//native_client/src/trusted/desc:nrd_xfer",
     "//native_client/src/trusted/platform_qualify:platform_qual_lib",
     "//native_client/src/trusted/simple_service",
     "//ppapi/c",
     "//ppapi/cpp:objects",
     "//ppapi/cpp/private:internal_module",
     "//ppapi/proxy:ipc",
   ]
 
   if (is_linux) {
     cflags = [ "-Wno-long-long" ]
 
     ldflags = [ "-Wl,-z,defs" ]
 
     libs = [ "dl" ]
   }
 }