Update ACM to use RTPHeader instead of WebRtcRTPHeader

Bug: webrtc:5876
Change-Id: Id3311dcf508cca34495349197eeac2edf8783772
Reviewed-on: https://webrtc-review.googlesource.com/c/123188
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26729}
diff --git a/modules/audio_coding/acm2/acm_receiver.h b/modules/audio_coding/acm2/acm_receiver.h
index 3e30b86..1f449a3 100644
--- a/modules/audio_coding/acm2/acm_receiver.h
+++ b/modules/audio_coding/acm2/acm_receiver.h
@@ -33,7 +33,6 @@
 class Clock;
 class NetEq;
 struct RTPHeader;
-struct WebRtcRTPHeader;
 
 namespace acm2 {
 
@@ -58,7 +57,7 @@
   // Return value             : 0 if OK.
   //                           <0 if NetEq returned an error.
   //
-  int InsertPacket(const WebRtcRTPHeader& rtp_header,
+  int InsertPacket(const RTPHeader& rtp_header,
                    rtc::ArrayView<const uint8_t> incoming_payload);
 
   //