message: Remove unused includes from RtpFrameReferenceFinder.
  Cr-Commit-Position: refs/heads/master@{#32654}
diff: #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"
  