Swap use of CriticalSectionWrapper with rtc::CriticalSection in voice_engine/
Also remove mischievous tab character!
This is a part of getting rid of CriticalSectionWrapper and makes the code slightly simpler.

BUG=

Review URL: https://codereview.webrtc.org/1607353002

Cr-Commit-Position: refs/heads/master@{#11346}
diff --git a/webrtc/voice_engine/level_indicator.h b/webrtc/voice_engine/level_indicator.h
index c9b0b14..0f146ce 100644
--- a/webrtc/voice_engine/level_indicator.h
+++ b/webrtc/voice_engine/level_indicator.h
@@ -11,13 +11,13 @@
 #ifndef WEBRTC_VOICE_ENGINE_LEVEL_INDICATOR_H
 #define WEBRTC_VOICE_ENGINE_LEVEL_INDICATOR_H
 
+#include "webrtc/base/criticalsection.h"
 #include "webrtc/typedefs.h"
 #include "webrtc/voice_engine/voice_engine_defines.h"
 
 namespace webrtc {
 
 class AudioFrame;
-class CriticalSectionWrapper;
 namespace voe {
 
 class AudioLevel
@@ -40,7 +40,7 @@
 private:
     enum { kUpdateFrequency = 10};
 
-    CriticalSectionWrapper& _critSect;
+    mutable rtc::CriticalSection _critSect;
 
     int16_t _absMax;
     int16_t _count;