Remove ALL usage of CriticalSectionWrapper.

webrtc/system_wrappers/source/rw_lock_winxp_win.h

-/*
- *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_RW_LOCK_WINXP_WIN_H_
-#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_RW_LOCK_WINXP_WIN_H_
-
-#include "webrtc/system_wrappers/include/rw_lock_wrapper.h"
-#include "webrtc/system_wrappers/source/condition_variable_event_win.h"
-#include "webrtc/typedefs.h"
-
-namespace webrtc {
-
-class RWLockWinXP : public RWLockWrapper {
- public:
-  RWLockWinXP();
-  ~RWLockWinXP() override;
-
-  void AcquireLockExclusive() override;
-  void ReleaseLockExclusive() override;
-
-  void AcquireLockShared() override;
-  void ReleaseLockShared() override;
-
- private:
-  CRITICAL_SECTION critical_section_;
-  ConditionVariableEventWin read_condition_;
-  ConditionVariableEventWin write_condition_;
-
-  int readers_active_ = 0;
-  bool writer_active_ = false;
-  int readers_waiting_ = 0;
-  int writers_waiting_ = 0;
-};
-
-}  // namespace webrtc
-
-#endif  // WEBRTC_SYSTEM_WRAPPERS_SOURCE_RW_LOCK_WINXP_WIN_H_