Revert "APM: log both applied and recommended input volume stats"

This reverts commit 8d7273357d92fab881561d886ce8dfe94e6e2238.

Reason for revert: revert needed to land https://webrtc-review.googlesource.com/c/src/+/280600

Original change's description:
> APM: log both applied and recommended input volume stats
>
> This CL replaces the existing `WebRTC.Audio.ApmAnalogGain.*` stats
> with `WebRTC.Audio.Apm.AppliedInputVolume.*` and adds the
> `WebRTC.Audio.Apm.RecommendedInputVolume.*` stats.
>
> Bug: webrtc:7494
> Change-Id: I70be710d20b1589fc814cbce3d3329ac1500686f
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/280220
> Reviewed-by: Hanna Silen <silen@webrtc.org>
> Commit-Queue: Alessio Bazzica <alessiob@webrtc.org>
> Cr-Commit-Position: refs/heads/main@{#38468}

Bug: webrtc:7494
Change-Id: I4a2acfd5a983d9397932b2879cfa057deaf0eb2b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/280581
Commit-Queue: Alessio Bazzica <alessiob@webrtc.org>
Auto-Submit: Alessio Bazzica <alessiob@webrtc.org>
Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#38476}
diff --git a/modules/audio_processing/audio_processing_impl.cc b/modules/audio_processing/audio_processing_impl.cc
index a0415e2..76e3804 100644
--- a/modules/audio_processing/audio_processing_impl.cc
+++ b/modules/audio_processing/audio_processing_impl.cc
@@ -291,11 +291,7 @@
                  MinimizeProcessingForUnusedOutput(),
                  field_trial::IsEnabled("WebRTC-TransientSuppressorForcedOff")),
       capture_(),
-      capture_nonlocked_(),
-      applied_input_volume_stats_reporter_(
-          InputVolumeStatsReporter::InputVolumeType::kApplied),
-      recommended_input_volume_stats_reporter_(
-          InputVolumeStatsReporter::InputVolumeType::kRecommended) {
+      capture_nonlocked_() {
   RTC_LOG(LS_INFO) << "Injected APM submodules:"
                       "\nEcho control factory: "
                    << !!echo_control_factory_
@@ -1365,10 +1361,6 @@
   stats_reporter_.UpdateStatistics(capture_.stats);
 
   UpdateRecommendedInputVolumeLocked();
-  if (capture_.recommended_input_volume.has_value()) {
-    recommended_input_volume_stats_reporter_.UpdateStatistics(
-        *capture_.recommended_input_volume);
-  }
 
   if (submodules_.capture_levels_adjuster) {
     submodules_.capture_levels_adjuster->ApplyPostLevelAdjustment(