Don't disable fec for packets without timing frames extension, even if

webrtc/modules/rtp_rtcp/source/rtp_sender_unittest.cc

Index: webrtc/modules/rtp_rtcp/source/rtp_sender_unittest.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_sender_unittest.cc b/webrtc/modules/rtp_rtcp/source/rtp_sender_unittest.cc
index 9759f1799d5809f93bae00b101f48f8f1ac3269f..bcfa650c02dbfd2755462281eb6695a10776cdce 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_sender_unittest.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_sender_unittest.cc
@@ -951,6 +951,7 @@ TEST_P(RtpSenderTest, NoFlexfecForTimingFrames) {
   constexpr uint32_t kFlexfecSsrc = 5678;
   const std::vector<RtpExtension> kNoRtpExtensions;
   const std::vector<RtpExtensionSize> kNoRtpExtensionSizes;
+
   FlexfecSender flexfec_sender(kFlexfecPayloadType, kFlexfecSsrc, kMediaSsrc,
                                kNoRtpExtensions, kNoRtpExtensionSizes,
                                nullptr /* rtp_state */, &fake_clock_);
@@ -966,6 +967,10 @@ TEST_P(RtpSenderTest, NoFlexfecForTimingFrames) {
   rtp_sender_->SetSendPayloadType(kMediaPayloadType);
   rtp_sender_->SetStorePacketsStatus(true, 10);
 
+  // Need extension to be registered for timing frames to be sent.
+  ASSERT_EQ(0, rtp_sender_->RegisterRtpHeaderExtension(
+                   kRtpExtensionVideoTiming, kVideoTimingExtensionId));
+
   // Parameters selected to generate a single FEC packet per media packet.
   FecProtectionParams params;
   params.fec_rate = 15;