Remove ConditionVariableWrapper.

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/system_wrappers/include/critical_section_wrapper.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:
-  CriticalSectionWrapper critical_section_;
+  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_