Deprecate RTPFragmentationHeader argument to AudioPacketizationCallback::SendData

It appears unused everywhere. It will be deleted in a followup cl.

Bug: webrtc:6471
Change-Id: Ief992db6e52aee3cf1bc77ffd659ffbc072672ba
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/134212
Reviewed-by: Oskar Sundbom <ossu@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27787}
diff --git a/modules/audio_coding/acm2/acm_send_test.h b/modules/audio_coding/acm2/acm_send_test.h
index 744d015..f4a6fc4 100644
--- a/modules/audio_coding/acm2/acm_send_test.h
+++ b/modules/audio_coding/acm2/acm_send_test.h
@@ -54,8 +54,7 @@
                    uint8_t payload_type,
                    uint32_t timestamp,
                    const uint8_t* payload_data,
-                   size_t payload_len_bytes,
-                   const RTPFragmentationHeader* fragmentation) override;
+                   size_t payload_len_bytes) override;
 
   AudioCodingModule* acm() { return acm_.get(); }