Remove more CriticalSectionWrappers.

webrtc/modules/audio_device/linux/audio_mixer_manager_alsa_linux.h

Index: webrtc/modules/audio_device/linux/audio_mixer_manager_alsa_linux.h
diff --git a/webrtc/modules/audio_device/linux/audio_mixer_manager_alsa_linux.h b/webrtc/modules/audio_device/linux/audio_mixer_manager_alsa_linux.h
index b8be8c1b708907c91353b2dc2ec0bf631b87b20c..0ad11c8b6de7c5fcae29147ed36bbb07a0221019 100644
--- a/webrtc/modules/audio_device/linux/audio_mixer_manager_alsa_linux.h
+++ b/webrtc/modules/audio_device/linux/audio_mixer_manager_alsa_linux.h
@@ -11,9 +11,9 @@
 #ifndef WEBRTC_AUDIO_DEVICE_AUDIO_MIXER_MANAGER_ALSA_LINUX_H
 #define WEBRTC_AUDIO_DEVICE_AUDIO_MIXER_MANAGER_ALSA_LINUX_H
 
+#include "webrtc/base/criticalsection.h"
 #include "webrtc/modules/audio_device/include/audio_device.h"
 #include "webrtc/modules/audio_device/linux/alsasymboltable_linux.h"
-#include "webrtc/system_wrappers/include/critical_section_wrapper.h"
 #include "webrtc/typedefs.h"
 
 #include <alsa/asoundlib.h>
@@ -63,7 +63,7 @@ private:
     void GetControlName(char *controlName, char* deviceName) const;
 
 private:
-    CriticalSectionWrapper& _critSect;
+    rtc::CriticalSection _critSect;
     int32_t _id;
     mutable snd_mixer_t* _outputMixerHandle;
     char _outputMixerStr[kAdmMaxDeviceNameSize];