Move Ownership of RtpModules to VideoSendStream.

webrtc/video/encoder_state_feedback.cc

Index: webrtc/video/encoder_state_feedback.cc
diff --git a/webrtc/video/encoder_state_feedback.cc b/webrtc/video/encoder_state_feedback.cc
index 0240e487a6a7090d0c8919683948322f5451932a..52f51114fa8b5710b231908e542e15602fe95556 100644
--- a/webrtc/video/encoder_state_feedback.cc
+++ b/webrtc/video/encoder_state_feedback.cc
@@ -25,13 +25,6 @@ void EncoderStateFeedback::Init(const std::vector<uint32_t>& ssrcs,
   vie_encoder_ = encoder;
 }
 
-void EncoderStateFeedback::TearDown() {
-  rtc::CritScope lock(&crit_);
-  RTC_DCHECK(vie_encoder_);
-  ssrcs_.clear();
-  vie_encoder_ = nullptr;
-}
-
 bool EncoderStateFeedback::HasSsrc(uint32_t ssrc) {
   for (uint32_t registered_ssrc : ssrcs_) {
     if (registered_ssrc == ssrc)