Adopt absl::string_view in modules/audio_coding/

Bug: webrtc:13579
Change-Id: Ifec66fb6ba9724d18539de7245a358c2d13c7939
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/268547
Reviewed-by: Ivo Creusen <ivoc@webrtc.org>
Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
Commit-Queue: Ali Tofigh <alito@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37573}
diff --git a/modules/audio_coding/acm2/acm_send_test.cc b/modules/audio_coding/acm2/acm_send_test.cc
index a84fa7c..3e65f94 100644
--- a/modules/audio_coding/acm2/acm_send_test.cc
+++ b/modules/audio_coding/acm2/acm_send_test.cc
@@ -14,6 +14,7 @@
 #include <string.h>
 
 #include "absl/strings/match.h"
+#include "absl/strings/string_view.h"
 #include "api/audio_codecs/audio_encoder.h"
 #include "api/audio_codecs/builtin_audio_decoder_factory.h"
 #include "api/audio_codecs/builtin_audio_encoder_factory.h"
@@ -57,7 +58,7 @@
 
 AcmSendTestOldApi::~AcmSendTestOldApi() = default;
 
-bool AcmSendTestOldApi::RegisterCodec(const char* payload_name,
+bool AcmSendTestOldApi::RegisterCodec(absl::string_view payload_name,
                                       int clockrate_hz,
                                       int num_channels,
                                       int payload_type,