Change RtcpPacket::PacketReadyCallback to rtc::FunctionView

from interface


Bug: webrtc:5565
Change-Id: I2df5d7a0554b938888581f1c73dbdb8b85c387cc
Reviewed-on: https://webrtc-review.googlesource.com/8680
Reviewed-by: Niels Moller <nisse@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21136}

modules/rtp_rtcp/source/rtcp_packet/nack.h

@@ -38,7 +38,7 @@ class Nack : public Rtpfb {
   bool Create(uint8_t* packet,
               size_t* index,
               size_t max_length,
-              RtcpPacket::PacketReadyCallback* callback) const override;
+              PacketReadyCallback callback) const override;
 
  private:
   static constexpr size_t kNackItemLength = 4;