Introduced the new parameter setting scheme for activating the high-pass filter in APM

webrtc/modules/audio_processing/high_pass_filter_impl.h

Index: webrtc/modules/audio_processing/high_pass_filter_impl.h
diff --git a/webrtc/modules/audio_processing/high_pass_filter_impl.h b/webrtc/modules/audio_processing/high_pass_filter_impl.h
index 5cb18f12d08d06b56a8802964fdddd5d2810f3bf..b5fc7d99b47fbed25f07db5664c60065df124714 100644
--- a/webrtc/modules/audio_processing/high_pass_filter_impl.h
+++ b/webrtc/modules/audio_processing/high_pass_filter_impl.h
@@ -15,31 +15,24 @@
 #include <vector>
 
 #include "webrtc/base/constructormagic.h"
-#include "webrtc/base/criticalsection.h"
 #include "webrtc/modules/audio_processing/include/audio_processing.h"
 
 namespace webrtc {
 
 class AudioBuffer;
+class AudioProcessingImpl;
 
 class HighPassFilterImpl : public HighPassFilter {
  public:
-  explicit HighPassFilterImpl(rtc::CriticalSection* crit);
+  explicit HighPassFilterImpl(AudioProcessingImpl* apm);
   ~HighPassFilterImpl() override;
 
-  // TODO(peah): Fold into ctor, once public API is removed.
-  void Initialize(size_t channels, int sample_rate_hz);
-  void ProcessCaptureAudio(AudioBuffer* audio);
-
   // HighPassFilter implementation.
   int Enable(bool enable) override;
   bool is_enabled() const override;
 
  private:
-  class BiquadFilter;
-  rtc::CriticalSection* const crit_ = nullptr;
-  bool enabled_ GUARDED_BY(crit_) = false;
-  std::vector<std::unique_ptr<BiquadFilter>> filters_ GUARDED_BY(crit_);
+  AudioProcessingImpl* apm_;
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(HighPassFilterImpl);
 };
 }  // namespace webrtc