Remove ALL usage of CriticalSectionWrapper.

webrtc/modules/audio_device/mac/audio_device_mac.h

Index: webrtc/modules/audio_device/mac/audio_device_mac.h
diff --git a/webrtc/modules/audio_device/mac/audio_device_mac.h b/webrtc/modules/audio_device/mac/audio_device_mac.h
index ccde6f00d2cc89a6ca9a6ee86b39f0fff9ec752d..52b44eb4ffb428c3d67dc454cfcc34ca36a82664 100644
--- a/webrtc/modules/audio_device/mac/audio_device_mac.h
+++ b/webrtc/modules/audio_device/mac/audio_device_mac.h
@@ -13,10 +13,11 @@
 
 #include <memory>
 
+#include "webrtc/base/criticalsection.h"
 #include "webrtc/base/thread_annotations.h"
 #include "webrtc/modules/audio_device/audio_device_generic.h"
 #include "webrtc/modules/audio_device/mac/audio_mixer_manager_mac.h"
-#include "webrtc/system_wrappers/include/critical_section_wrapper.h"
+#include "webrtc/system_wrappers/include/event_wrapper.h"
 
 #include <AudioToolbox/AudioConverter.h>
 #include <CoreAudio/CoreAudio.h>
@@ -283,7 +284,7 @@ class AudioDeviceMac : public AudioDeviceGeneric {
 
   AudioDeviceBuffer* _ptrAudioBuffer;
 
-  CriticalSectionWrapper& _critSect;
+  rtc::CriticalSection _critSect;
 
   EventWrapper& _stopEventRec;
   EventWrapper& _stopEvent;