Delete some unused code found by -Wunused-function

ppapi/proxy/ppb_file_ref_proxy.cc

 // Copyright (c) 2012 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.
 
 #include "ppapi/proxy/ppb_file_ref_proxy.h"
 
 #include <map>
 
 #include "base/bind.h"
 #include "ppapi/c/pp_errors.h"
@@ skipping 147 matching lines @@
 
 int FileRef::SendCallback(scoped_refptr<TrackedCallback> callback) {
   // In extreme cases the IDs may wrap around, so avoid duplicates.
   while (pending_callbacks_.count(next_callback_id_))
     ++next_callback_id_;
 
   pending_callbacks_[next_callback_id_] = callback;
   return next_callback_id_++;
 }
 
-namespace {
-
-InterfaceProxy* CreateFileRefProxy(Dispatcher* dispatcher) {
-  return new PPB_FileRef_Proxy(dispatcher);
-}
-
-}  // namespace
-
 PPB_FileRef_Proxy::PPB_FileRef_Proxy(Dispatcher* dispatcher)
     : InterfaceProxy(dispatcher),
       callback_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
 }
 
 PPB_FileRef_Proxy::~PPB_FileRef_Proxy() {
 }
 
 // static
 PP_Resource PPB_FileRef_Proxy::CreateProxyResource(PP_Resource file_system,
@@ skipping 134 matching lines @@
     int32_t result,
     const HostResource& host_resource,
     int callback_id) {
   // Execute OnMsgCallbackComplete in the plugin process.
   Send(new PpapiMsg_PPBFileRef_CallbackComplete(
       API_ID_PPB_FILE_REF, host_resource, callback_id, result));
 }
 
 }  // namespace proxy
 }  // namespace ppapi