[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}

modules/audio_coding/neteq/packet_buffer.cc

@@ -14,12 +14,17 @@
 
 #include "modules/audio_coding/neteq/packet_buffer.h"
 
-#include <algorithm>  // find_if()
+#include <algorithm>
+#include <list>
+#include <memory>
+#include <type_traits>
+#include <utility>
 
 #include "api/audio_codecs/audio_decoder.h"
 #include "modules/audio_coding/neteq/decoder_database.h"
 #include "modules/audio_coding/neteq/statistics_calculator.h"
 #include "modules/audio_coding/neteq/tick_timer.h"
+#include "rtc_base/checks.h"
 #include "rtc_base/logging.h"
 
 namespace webrtc {