Prevent warning logs when signaling stats from connectionless sockets.

Signaling per-packet stats invokes GetRemoteAddress and a warning log is
output for each signal in SendTo for UDP sockets. This creates noise in
the debug log.

Bug: webrtc:9103
Change-Id: Ibf4667cf196aef971452f745bef3c02fb1dbf3d4
Reviewed-on: https://webrtc-review.googlesource.com/70364
Commit-Queue: Qingsi Wang <qingsi@google.com>
Reviewed-by: Bjorn Mellem <mellem@webrtc.org>
Reviewed-by: Taylor Brandstetter <deadbeef@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22911}

rtc_base/asyncpacketsocket.h

@@ -145,6 +145,7 @@ class AsyncPacketSocket : public sigslot::has_slots<> {
 
 void CopySocketInformationToPacketInfo(size_t packet_size_bytes,
                                        const AsyncPacketSocket& socket_from,
+                                       bool is_connectionless,
                                        rtc::PacketInfo* info);
 
 }  // namespace rtc