Use the AEC3 high-pass filter for the whole APM

This CL removes and replaces the legacy fixed-point high-pass filter in
APM with the floating point high-pass filter in AEC3.

Bug: webrtc:10907
Change-Id: I88cf8f622ab139e4ffa97f89a72425aa3becfc58
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/150103
Commit-Queue: Per Åhgren <peah@webrtc.org>
Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28950}
diff --git a/modules/audio_processing/audio_processing_impl.h b/modules/audio_processing/audio_processing_impl.h
index 1539cd5..6bda06a 100644
--- a/modules/audio_processing/audio_processing_impl.h
+++ b/modules/audio_processing/audio_processing_impl.h
@@ -193,7 +193,7 @@
     bool RenderMultiBandSubModulesActive() const;
     bool RenderFullBandProcessingActive() const;
     bool RenderMultiBandProcessingActive() const;
-    bool LowCutFilteringRequired() const;
+    bool HighPassFilteringRequired() const;
 
    private:
     const bool capture_post_processor_enabled_ = false;
@@ -238,7 +238,7 @@
       RTC_EXCLUSIVE_LOCKS_REQUIRED(crit_render_, crit_capture_);
   void InitializeResidualEchoDetector()
       RTC_EXCLUSIVE_LOCKS_REQUIRED(crit_render_, crit_capture_);
-  void InitializeLowCutFilter() RTC_EXCLUSIVE_LOCKS_REQUIRED(crit_capture_);
+  void InitializeHighPassFilter() RTC_EXCLUSIVE_LOCKS_REQUIRED(crit_capture_);
   void InitializeEchoController()
       RTC_EXCLUSIVE_LOCKS_REQUIRED(crit_render_, crit_capture_);
   void InitializeGainController2() RTC_EXCLUSIVE_LOCKS_REQUIRED(crit_capture_);