Switch to standard integer types in sync/.

sync/internal_api/public/base/unique_position.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_INTERNAL_API_PUBLIC_BASE_UNIQUE_POSITION_H_
 #define SYNC_INTERNAL_API_PUBLIC_BASE_UNIQUE_POSITION_H_
 
+#include <stddef.h>
 #include <stdint.h>
 
 #include <string>
 
 #include "sync/base/sync_export.h"
 
 namespace sync_pb {
 class UniquePosition;
 }
 
@@ skipping 119 matching lines @@
 
   // The position value after it has been run through the custom compression
   // algorithm.  See Compress() and Uncompress() functions above.
   std::string compressed_;
   bool is_valid_;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_BASE_UNIQUE_POSITION_H_