Use new CopyOnWriteBuffer ctor/append function in H264PacketBuffer.

Bug: none
Change-Id: I02aace124f3f5a578a52348675b346ff890d8d82
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/232900
Commit-Queue: Philip Eliasson <philipel@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35082}
diff --git a/modules/video_coding/h264_packet_buffer.cc b/modules/video_coding/h264_packet_buffer.cc
index 8968539..7b821a1 100644
--- a/modules/video_coding/h264_packet_buffer.cc
+++ b/modules/video_coding/h264_packet_buffer.cc
@@ -107,13 +107,13 @@
       if (IsFirstPacketOfFragment(h264_header)) {
         result.AppendData(kStartCode);
       }
-      result.AppendData(payload.data(), payload.size());
+      result.AppendData(payload);
       return result;
     }
 
     case kH264SingleNalu: {
       result.AppendData(kStartCode);
-      result.AppendData(payload.data(), payload.size());
+      result.AppendData(payload);
       return result;
     }
   }