Remove #pragma once. Just from base/ for now.

base/win/resource_util.h

 // Copyright (c) 2011 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.
 
 // This file contains utility functions for accessing resources in external
 // files (DLLs) or embedded in the executable itself.
 
 #ifndef BASE_WIN_RESOURCE_UTIL_H__
 #define BASE_WIN_RESOURCE_UTIL_H__
-#pragma once
 
 #include <windows.h>
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
 
 namespace base {
 namespace win {
 
 // Function for getting a data resource (BINDATA) from a dll.  Some
 // resources are optional, especially in unit tests, so this returns false
 // but doesn't raise an error if the resource can't be loaded.
 bool BASE_EXPORT GetDataResourceFromModule(HMODULE module, int resource_id,
                                            void** data, size_t* length);
 
 }  // namespace win
 }  // namespace base
 
 #endif  // BASE_WIN_RESOURCE_UTIL_H__