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

base/vlog.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_VLOG_H_
 #define BASE_VLOG_H_
-#pragma once
 
 #include <cstddef>
 #include <string>
 #include <vector>
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
 #include "base/string_piece.h"
 
 namespace logging {
@@ skipping 52 matching lines @@
 //   "kh?n" matches "khan" but not "khn" or "khaan"
 //   "kh*n" matches "khn", "khan", or even "khaaaaan"
 //   "/foo\bar" matches "/foo/bar", "\foo\bar", or "/foo\bar"
 //     (disregarding C escaping rules)
 BASE_EXPORT bool MatchVlogPattern(const base::StringPiece& string,
                                   const base::StringPiece& vlog_pattern);
 
 }  // namespace logging
 
 #endif  // BASE_VLOG_H_