Remove PacedSender::PacketSender interface and use PacketRouter directly

This interface makes future refactoring difficult and is now in practice
only implemented by PacketRouter.

Bug: webrtc:10633
Change-Id: I3fcb8940781aa7431119649bde7594592a8c8851
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/141669
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28251}
diff --git a/rtc_tools/event_log_visualizer/analyzer.cc b/rtc_tools/event_log_visualizer/analyzer.cc
index c15454b..428300d 100644
--- a/rtc_tools/event_log_visualizer/analyzer.cc
+++ b/rtc_tools/event_log_visualizer/analyzer.cc
@@ -40,6 +40,7 @@
 #include "modules/congestion_controller/goog_cc/delay_based_bwe.h"
 #include "modules/congestion_controller/include/receive_side_congestion_controller.h"
 #include "modules/congestion_controller/rtp/transport_feedback_adapter.h"
+#include "modules/pacing/paced_sender.h"
 #include "modules/pacing/packet_router.h"
 #include "modules/remote_bitrate_estimator/include/bwe_defines.h"
 #include "modules/rtp_rtcp/include/rtp_rtcp.h"