Revert of RTCRtpReceiver.getContributingSources() added.

content/renderer/media/webrtc/rtc_rtp_receiver.h

 // Copyright (c) 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_MEDIA_WEBRTC_RTC_RTP_RECEIVER_H_
 #define CONTENT_RENDERER_MEDIA_WEBRTC_RTC_RTP_RECEIVER_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
 #include "third_party/WebKit/public/platform/WebRTCRtpReceiver.h"
 #include "third_party/webrtc/api/rtpreceiverinterface.h"
 
 namespace content {
 
 // Used to surface |webrtc::RtpReceiverInterface| to blink. Multiple
 // |RTCRtpReceiver|s could reference the same webrtc receiver; |id| is the value
 // of the pointer to the webrtc receiver.
 class CONTENT_EXPORT RTCRtpReceiver : public blink::WebRTCRtpReceiver {
  public:
   static uintptr_t getId(
       const webrtc::RtpReceiverInterface* webrtc_rtp_receiver);
 
   RTCRtpReceiver(webrtc::RtpReceiverInterface* webrtc_rtp_receiver,
                  const blink::WebMediaStreamTrack& web_track);
   ~RTCRtpReceiver() override;
 
   uintptr_t Id() const override;
+
   const blink::WebMediaStreamTrack& Track() const override;
-  blink::WebVector<std::unique_ptr<blink::WebRTCRtpContributingSource>>
-  GetSources() override;
-
   const webrtc::MediaStreamTrackInterface& webrtc_track() const;
 
  private:
   const scoped_refptr<webrtc::RtpReceiverInterface> webrtc_rtp_receiver_;
   const blink::WebMediaStreamTrack web_track_;
 
   DISALLOW_COPY_AND_ASSIGN(RTCRtpReceiver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_WEBRTC_RTC_RTP_RECEIVER_H_