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/test/Channel.h b/modules/audio_coding/test/Channel.h
index 6a55b06..0b248c8 100644
--- a/modules/audio_coding/test/Channel.h
+++ b/modules/audio_coding/test/Channel.h
@@ -51,8 +51,7 @@
                    uint8_t payloadType,
                    uint32_t timeStamp,
                    const uint8_t* payloadData,
-                   size_t payloadSize,
-                   const RTPFragmentationHeader* fragmentation) override;
+                   size_t payloadSize) override;
 
   void RegisterReceiverACM(AudioCodingModule* acm);