Remove #pragma once from sync

sync/util/logging.h

 // 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.
 
 #ifndef SYNC_UTIL_LOGGING_H_
 #define SYNC_UTIL_LOGGING_H_
-#pragma once
 
 #include "base/logging.h"
 
 // TODO(akalin): This probably belongs in base/ somewhere.
 
 namespace tracked_objects {
 class Location;
 }  // namespace tracked_objects
 
 namespace syncer {
 
 bool VlogIsOnForLocation(const tracked_objects::Location& from_here,
                          int verbose_level);
 
 }  // namespace syncer
 
 #define VLOG_LOC_STREAM(from_here, verbose_level)                       \
   logging::LogMessage(from_here.file_name(), from_here.line_number(),   \
                       -verbose_level).stream()
 
 #define DVLOG_LOC(from_here, verbose_level)                             \
   LAZY_STREAM(                                                          \
       VLOG_LOC_STREAM(from_here, verbose_level),                        \
       ::logging::DEBUG_MODE &&                                          \
       (VLOG_IS_ON(verbose_level) ||                                     \
        ::syncer::VlogIsOnForLocation(from_here, verbose_level)))  \
 
 #endif  // SYNC_UTIL_LOGGING_H_