Delete unused methods of the VideoProcessing class. And fix a typo.

webrtc/modules/video_processing/video_processing_impl.h

 /*
  *  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_MODULES_VIDEO_PROCESSING_VIDEO_PROCESSING_IMPL_H_
 #define WEBRTC_MODULES_VIDEO_PROCESSING_VIDEO_PROCESSING_IMPL_H_
 
 #include "webrtc/base/criticalsection.h"
 #include "webrtc/modules/video_processing/include/video_processing.h"
-#include "webrtc/modules/video_processing/brightness_detection.h"
-#include "webrtc/modules/video_processing/deflickering.h"
 #include "webrtc/modules/video_processing/frame_preprocessor.h"
 
 namespace webrtc {
 class CriticalSectionWrapper;
 
 class VideoProcessingImpl : public VideoProcessing {
  public:
   VideoProcessingImpl();
   ~VideoProcessingImpl() override;
 
   // Implements VideoProcessing.
-  int32_t Deflickering(VideoFrame* frame, FrameStats* stats) override;
-  int32_t BrightnessDetection(const VideoFrame& frame,
-                              const FrameStats& stats) override;
   void EnableTemporalDecimation(bool enable) override;
   void SetInputFrameResampleMode(VideoFrameResampling resampling_mode) override;
   void EnableContentAnalysis(bool enable) override;
   int32_t SetTargetResolution(uint32_t width,
                               uint32_t height,
                               uint32_t frame_rate) override;
   void SetTargetFramerate(int frame_rate) override;
   uint32_t GetDecimatedFrameRate() override;
   uint32_t GetDecimatedWidth() const override;
   uint32_t GetDecimatedHeight() const override;
-  void EnableDenosing(bool enable) override;
+  void EnableDenoising(bool enable) override;
   const VideoFrame* PreprocessFrame(const VideoFrame& frame) override;
   VideoContentMetrics* GetContentMetrics() const override;
 
  private:
   rtc::CriticalSection mutex_;
-  VPMDeflickering deflickering_ GUARDED_BY(mutex_);
-  VPMBrightnessDetection brightness_detection_;
-  VPMFramePreprocessor frame_pre_processor_;
+  VPMFramePreprocessor frame_pre_processor_ GUARDED_BY(mutex_);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_PROCESSING_VIDEO_PROCESSING_IMPL_H_