Bug 1847074 - Vendor libwebrtc from 2abe6e2214

We already cherry-picked this when we vendored 151be743d4.

Upstream commit: https://webrtc.googlesource.com/src/+/2abe6e2214fa4fcecdb9614715c55a82c0067e25
    [M115] Bail out early if the RTP send module for a SSRC was not found

    since it might have been deregistered previously.

    BUG=chromium:1454860,chromium:1459124

    (cherry picked from commit c0ed83eac258032a2416b7e4200bd074a6455f4b)

    Change-Id: I70ba43265361d040e568f83b6400ff8f3c2a8e98
    Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/311800
    Reviewed-by: Harald Alvestrand <hta@webrtc.org>
    Commit-Queue: Philipp Hancke <phancke@microsoft.com>
    Cr-Original-Commit-Position: refs/heads/main@{#40431}
    Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/312121
    Cr-Commit-Position: refs/branch-heads/5790@{#7}
    Cr-Branched-From: 2eacbbc03a4a41ea658661225eb1c8fc07884c33-refs/heads/main@{#40122}

third_party/libwebrtc/README.moz-ff-commit

@@ -24042,3 +24042,6 @@ f5ffd45855
 # MOZ_LIBWEBRTC_SRC=/home/mfroman/mozilla/elm/.moz-fast-forward/moz-libwebrtc MOZ_LIBWEBRTC_BRANCH=mozpatches bash dom/media/webrtc/third_party_build/fast-forward-libwebrtc.sh
 # base of lastest vendoring
 43670de877
+# MOZ_LIBWEBRTC_SRC=/home/mfroman/mozilla/elm/.moz-fast-forward/moz-libwebrtc MOZ_LIBWEBRTC_BRANCH=mozpatches bash dom/media/webrtc/third_party_build/fast-forward-libwebrtc.sh
+# base of lastest vendoring
+2abe6e2214

third_party/libwebrtc/README.mozilla

@@ -16050,3 +16050,5 @@ libwebrtc updated from /home/mfroman/mozilla/elm/.moz-fast-forward/moz-libwebrtc
 libwebrtc updated from /home/mfroman/mozilla/elm/.moz-fast-forward/moz-libwebrtc commit mozpatches on 2023-08-14T19:58:55.023984.
 # ./mach python dom/media/webrtc/third_party_build/vendor-libwebrtc.py --from-local /home/mfroman/mozilla/elm/.moz-fast-forward/moz-libwebrtc --commit mozpatches libwebrtc
 libwebrtc updated from /home/mfroman/mozilla/elm/.moz-fast-forward/moz-libwebrtc commit mozpatches on 2023-08-14T19:59:50.566324.
+# ./mach python dom/media/webrtc/third_party_build/vendor-libwebrtc.py --from-local /home/mfroman/mozilla/elm/.moz-fast-forward/moz-libwebrtc --commit mozpatches libwebrtc
+libwebrtc updated from /home/mfroman/mozilla/elm/.moz-fast-forward/moz-libwebrtc commit mozpatches on 2023-08-14T20:00:42.527963.

third_party/libwebrtc/modules/pacing/packet_router.cc

@@ -88,7 +88,10 @@ void PacketRouter::AddSendRtpModuleToMap(RtpRtcpInterface* rtp_module,
 void PacketRouter::RemoveSendRtpModuleFromMap(uint32_t ssrc) {
   RTC_DCHECK_RUN_ON(&thread_checker_);
   auto it = send_modules_map_.find(ssrc);
-  RTC_DCHECK(it != send_modules_map_.end());
+  if (it == send_modules_map_.end()) {
+    RTC_LOG(LS_ERROR) << "No send module found for ssrc " << ssrc;
+    return;
+  }
   send_modules_list_.remove(it->second);
   RTC_CHECK(modules_used_in_current_batch_.empty());
   send_modules_map_.erase(it);

third_party/libwebrtc/modules/pacing/packet_router_unittest.cc

@@ -541,18 +541,24 @@ TEST_F(PacketRouterDeathTest, DoubleRegistrationOfReceiveModuleDisallowed) {
   packet_router_.RemoveReceiveRtpModule(&module);
 }
 
-TEST_F(PacketRouterDeathTest, RemovalOfNeverAddedSendModuleDisallowed) {
+TEST_F(PacketRouterDeathTest, RemovalOfNeverAddedReceiveModuleDisallowed) {
   NiceMock<MockRtpRtcpInterface> module;
 
-  EXPECT_DEATH(packet_router_.RemoveSendRtpModule(&module), "");
+  EXPECT_DEATH(packet_router_.RemoveReceiveRtpModule(&module), "");
 }
+#endif  // RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
 
-TEST_F(PacketRouterDeathTest, RemovalOfNeverAddedReceiveModuleDisallowed) {
+TEST_F(PacketRouterTest, RemovalOfNeverAddedSendModuleIgnored) {
   NiceMock<MockRtpRtcpInterface> module;
+  packet_router_.RemoveSendRtpModule(&module);
+}
 
-  EXPECT_DEATH(packet_router_.RemoveReceiveRtpModule(&module), "");
+TEST_F(PacketRouterTest, DuplicateRemovalOfSendModuleIgnored) {
+  NiceMock<MockRtpRtcpInterface> module;
+  packet_router_.AddSendRtpModule(&module, false);
+  packet_router_.RemoveSendRtpModule(&module);
+  packet_router_.RemoveSendRtpModule(&module);
 }
-#endif  // RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
 
 TEST(PacketRouterRembTest, ChangeSendRtpModuleChangeRembSender) {
   rtc::ScopedFakeClock clock;