Interface RTCRtpReceiver and RTCPeerConnection.getReceivers() added.

content/renderer/media/mock_peer_connection_impl.h

Index: content/renderer/media/mock_peer_connection_impl.h
diff --git a/content/renderer/media/mock_peer_connection_impl.h b/content/renderer/media/mock_peer_connection_impl.h
index 629144689e7d66917394d7cc703c6dd927e20c0a..0c77c972342f16c384cd7392a40927b105ad6009 100644
--- a/content/renderer/media/mock_peer_connection_impl.h
+++ b/content/renderer/media/mock_peer_connection_impl.h
@@ -46,6 +46,8 @@ class MockPeerConnectionImpl : public webrtc::PeerConnectionInterface {
   }
   rtc::scoped_refptr<webrtc::DtmfSenderInterface>
       CreateDtmfSender(webrtc::AudioTrackInterface* track) override;
+  std::vector<rtc::scoped_refptr<webrtc::RtpReceiverInterface>> GetReceivers()
+      const override;
   rtc::scoped_refptr<webrtc::DataChannelInterface>
       CreateDataChannel(const std::string& label,
                         const webrtc::DataChannelInit* config) override;