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diff --git a/src/system_wrappers/source/critical_section_win.h b/src/system_wrappers/source/critical_section_win.h
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+++ b/src/system_wrappers/source/critical_section_win.h
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+/*
+ *  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_CRITICAL_SECTION_WINDOWS_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_CRITICAL_SECTION_WINDOWS_H_
+
+#include "typedefs.h"
+#include "critical_section_wrapper.h"
+#include <windows.h>
+
+namespace webrtc {
+class CriticalSectionWindows : public CriticalSectionWrapper
+{
+public:
+    CriticalSectionWindows();
+
+    virtual ~CriticalSectionWindows();
+
+    virtual void Enter();
+    virtual void Leave();
+
+private:
+    CRITICAL_SECTION crit;
+
+    friend class ConditionVariableWindows;
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_CRITICAL_SECTION_WINDOWS_H_