Update system_wrappers

Corresponds to upstream commit 524e9b043e7e86fd72353b987c9d5f6a1ebf83e1

webrtc/system_wrappers/source/critical_section_win.cc

@@ -0,0 +1,33 @@
+/*
+ *  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.
+ */
+
+#include "webrtc/system_wrappers/source/critical_section_win.h"
+
+namespace webrtc {
+
+CriticalSectionWindows::CriticalSectionWindows() {
+  InitializeCriticalSection(&crit);
+}
+
+CriticalSectionWindows::~CriticalSectionWindows() {
+  DeleteCriticalSection(&crit);
+}
+
+void
+CriticalSectionWindows::Enter() {
+  EnterCriticalSection(&crit);
+}
+
+void
+CriticalSectionWindows::Leave() {
+  LeaveCriticalSection(&crit);
+}
+
+}  // namespace webrtc