Delete unused member RTPSender::last_capture_time_ms_sent_

It was updated, but otherwise unused. And in addition, the update code
lacked needed synchronization.

Bug: webrtc:10033
Change-Id: I2a7b45550543a75d5f6b53032b512fd2fd120290
Reviewed-on: https://webrtc-review.googlesource.com/c/113041
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25892}
diff --git a/modules/rtp_rtcp/source/rtp_sender.cc b/modules/rtp_rtcp/source/rtp_sender.cc
index ddf91f5..3bb5552 100644
--- a/modules/rtp_rtcp/source/rtp_sender.cc
+++ b/modules/rtp_rtcp/source/rtp_sender.cc
@@ -131,7 +131,6 @@
       paced_sender_(paced_sender),
       transport_sequence_number_allocator_(sequence_number_allocator),
       transport_feedback_observer_(transport_feedback_observer),
-      last_capture_time_ms_sent_(0),
       transport_(transport),
       sending_media_(true),  // Default to sending media.
       force_part_of_allocation_(false),
@@ -952,10 +951,6 @@
 
     paced_sender_->InsertPacket(priority, ssrc, seq_no, corrected_time_ms,
                                 payload_length, false);
-    if (last_capture_time_ms_sent_ == 0 ||
-        corrected_time_ms > last_capture_time_ms_sent_) {
-      last_capture_time_ms_sent_ = corrected_time_ms;
-    }
     return true;
   }
 
diff --git a/modules/rtp_rtcp/source/rtp_sender.h b/modules/rtp_rtcp/source/rtp_sender.h
index f9bbbdd9..b0998e0 100644
--- a/modules/rtp_rtcp/source/rtp_sender.h
+++ b/modules/rtp_rtcp/source/rtp_sender.h
@@ -280,7 +280,6 @@
   RtpPacketSender* const paced_sender_;
   TransportSequenceNumberAllocator* const transport_sequence_number_allocator_;
   TransportFeedbackObserver* const transport_feedback_observer_;
-  int64_t last_capture_time_ms_sent_;
   rtc::CriticalSection send_critsect_;
 
   Transport* transport_;