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

base/memory/scoped_open_process.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.
 
 #ifndef BASE_MEMORY_SCOPED_OPEN_PROCESS_H_
 #define BASE_MEMORY_SCOPED_OPEN_PROCESS_H_
-#pragma once
 
 #include "base/process.h"
 #include "base/process_util.h"
 
 namespace base {
 
 // A class that opens a process from its process id and closes it when the
 // instance goes out of scope.
 class ScopedOpenProcess {
  public:
@@ skipping 23 matching lines @@
 
   ProcessHandle handle() const { return handle_; }
 
  private:
   ProcessHandle handle_;
   DISALLOW_COPY_AND_ASSIGN(ScopedOpenProcess);
 };
 }  // namespace base
 
 #endif  // BASE_MEMORY_SCOPED_OPEN_PROCESS_H_