Remove unused includes from RtpFrameReferenceFinder.

Bug: none
Change-Id: I4fc5f70e3e532c3735a97a9d7fd8f6f51d7d2a7f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/194333
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Commit-Queue: Philip Eliasson <philipel@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32654}
diff --git a/modules/video_coding/rtp_frame_reference_finder.cc b/modules/video_coding/rtp_frame_reference_finder.cc
index 2a43c27..ed4492a 100644
--- a/modules/video_coding/rtp_frame_reference_finder.cc
+++ b/modules/video_coding/rtp_frame_reference_finder.cc
@@ -11,12 +11,9 @@
 #include "modules/video_coding/rtp_frame_reference_finder.h"
 
 #include <algorithm>
-#include <limits>
 
 #include "absl/base/macros.h"
-#include "absl/types/variant.h"
 #include "modules/video_coding/frame_object.h"
-#include "modules/video_coding/packet_buffer.h"
 #include "rtc_base/checks.h"
 #include "rtc_base/logging.h"