Remove #pragma once from sync

sync/engine/build_commit_command.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_ENGINE_BUILD_COMMIT_COMMAND_H_
 #define SYNC_ENGINE_BUILD_COMMIT_COMMAND_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "sync/engine/syncer_command.h"
 #include "sync/engine/syncproto.h"
 #include "sync/syncable/entry_kernel.h"
 
 namespace syncer {
 
@@ skipping 52 matching lines @@
   // Input parameter; see constructor comment.
   const sessions::OrderedCommitSet& batch_commit_set_;
 
   // Output parameter; see constructor comment.
   ClientToServerMessage* commit_message_;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_BUILD_COMMIT_COMMAND_H_