Revert of RTCRtpReceiver.getContributingSources() added.

content/renderer/media/webrtc/rtc_rtp_receiver.cc

Index: content/renderer/media/webrtc/rtc_rtp_receiver.cc
diff --git a/content/renderer/media/webrtc/rtc_rtp_receiver.cc b/content/renderer/media/webrtc/rtc_rtp_receiver.cc
index c23a1349d4810722aa72caea012080fb2c71ca89..f558e74d5a56b392eae6fed584beb83448ea7f0c 100644
--- a/content/renderer/media/webrtc/rtc_rtp_receiver.cc
+++ b/content/renderer/media/webrtc/rtc_rtp_receiver.cc
@@ -5,8 +5,6 @@
 #include "content/renderer/media/webrtc/rtc_rtp_receiver.h"
 
 #include "base/logging.h"
-#include "base/memory/ptr_util.h"
-#include "content/renderer/media/webrtc/rtc_rtp_contributing_source.h"
 #include "third_party/webrtc/base/scoped_ref_ptr.h"
 
 namespace content {
@@ -45,17 +43,6 @@
   return web_track_;
 }
 
-blink::WebVector<std::unique_ptr<blink::WebRTCRtpContributingSource>>
-RTCRtpReceiver::GetSources() {
-  auto webrtc_sources = webrtc_rtp_receiver_->GetSources();
-  blink::WebVector<std::unique_ptr<blink::WebRTCRtpContributingSource>> sources(
-      webrtc_sources.size());
-  for (size_t i = 0; i < webrtc_sources.size(); ++i) {
-    sources[i] = base::MakeUnique<RTCRtpContributingSource>(webrtc_sources[i]);
-  }
-  return sources;
-}
-
 const webrtc::MediaStreamTrackInterface& RTCRtpReceiver::webrtc_track() const {
   const webrtc::MediaStreamTrackInterface* webrtc_track =
       webrtc_rtp_receiver_->track();