In AudioProcessing Simulator move AudioProcessing construction closer to api layer

Removing AudioProcessingBuilder from few layers would simplify replacing with BuiltinAudioProcessingFactory in the upcoming patches.

While doing cleanup also removed extra always empty parameters and run iwyu.

Bug: webrtc:369904700
Change-Id: I54d44993701c30ca8f4cf38e822af08531fba310
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/366260
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Sam Zackrisson <saza@webrtc.org>
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#43306}
diff --git a/modules/audio_processing/test/wav_based_simulator.h b/modules/audio_processing/test/wav_based_simulator.h
index 44e9ee2..7ac538d 100644
--- a/modules/audio_processing/test/wav_based_simulator.h
+++ b/modules/audio_processing/test/wav_based_simulator.h
@@ -13,7 +13,10 @@
 
 #include <vector>
 
+#include "absl/base/nullability.h"
 #include "absl/strings/string_view.h"
+#include "api/audio/audio_processing.h"
+#include "api/scoped_refptr.h"
 #include "modules/audio_processing/test/audio_processing_simulator.h"
 
 namespace webrtc {
@@ -22,9 +25,9 @@
 // Used to perform an audio processing simulation from wav files.
 class WavBasedSimulator final : public AudioProcessingSimulator {
  public:
-  WavBasedSimulator(const SimulationSettings& settings,
-                    rtc::scoped_refptr<AudioProcessing> audio_processing,
-                    std::unique_ptr<AudioProcessingBuilder> ap_builder);
+  WavBasedSimulator(
+      const SimulationSettings& settings,
+      absl::Nonnull<scoped_refptr<AudioProcessing>> audio_processing);
 
   WavBasedSimulator() = delete;
   WavBasedSimulator(const WavBasedSimulator&) = delete;