[Cleanup] Add missing #include. Remove useless ones.

This CL is the result of running include-what-you-use tool on part
of the code base (audio target and dependencies) plus manual fixes.

bug: webrtc:8311
Change-Id: I277d281ce943c3ecc1bd45fd8d83055931743604
Reviewed-on: https://webrtc-review.googlesource.com/c/106280
Commit-Queue: Yves Gerey <yvesg@google.com>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25311}
diff --git a/modules/audio_coding/acm2/acm_receiver.h b/modules/audio_coding/acm2/acm_receiver.h
index a2ae723..8e7d839 100644
--- a/modules/audio_coding/acm2/acm_receiver.h
+++ b/modules/audio_coding/acm2/acm_receiver.h
@@ -11,6 +11,7 @@
 #ifndef MODULES_AUDIO_CODING_ACM2_ACM_RECEIVER_H_
 #define MODULES_AUDIO_CODING_ACM2_ACM_RECEIVER_H_
 
+#include <stdint.h>
 #include <map>
 #include <memory>
 #include <string>
@@ -18,19 +19,21 @@
 
 #include "absl/types/optional.h"
 #include "api/array_view.h"
-#include "api/audio/audio_frame.h"
-#include "common_audio/vad/include/webrtc_vad.h"
+#include "api/audio_codecs/audio_decoder.h"
+#include "api/audio_codecs/audio_format.h"
 #include "modules/audio_coding/acm2/acm_resampler.h"
 #include "modules/audio_coding/acm2/call_statistics.h"
 #include "modules/audio_coding/include/audio_coding_module.h"
-#include "modules/audio_coding/neteq/include/neteq.h"
 #include "rtc_base/criticalsection.h"
 #include "rtc_base/thread_annotations.h"
 
 namespace webrtc {
 
+class Clock;
 struct CodecInst;
 class NetEq;
+struct RTPHeader;
+struct WebRtcRTPHeader;
 
 namespace acm2 {