[cros] RlzValueStore made protected by a cross-process lock and not persisted over browser lifetime…

rlz/lib/recursive_lock.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 RLZ_CHROMEOS_LIB_RECURSIVE_LOCK_H_
-#define RLZ_CHROMEOS_LIB_RECURSIVE_LOCK_H_
-
-#include "base/atomicops.h"
-#include "base/basictypes.h"
-#include "base/synchronization/lock.h"
-
-namespace rlz_lib {
-
-
-class RecursiveLock {
- public:
-  RecursiveLock();
-  ~RecursiveLock();
-
-  void Acquire();
-  void Release();
-
- private:
-  // Underlying non-recursive lock.
-  base::Lock lock_;
-  // Owner thread ID.
-  base::subtle::Atomic32 owner_;
-  // Recursion lock depth.
-  int recursion_;
-};
-
-}  // namespace rlz_lib
-
-#endif  // RLZ_CHROMEOS_LIB_RECURSIVE_LOCK_H_