Revert of Implemented the GetSources() in native code.

webrtc/pc/channel.h

Index: webrtc/pc/channel.h
diff --git a/webrtc/pc/channel.h b/webrtc/pc/channel.h
index 97ae3ba6f6647d2a86beeb9519531a9e651545d1..6ff0556c9798525ffbe3d29b739dc55085c8681c 100644
--- a/webrtc/pc/channel.h
+++ b/webrtc/pc/channel.h
@@ -19,7 +19,6 @@
 #include <vector>
 
 #include "webrtc/api/call/audio_sink.h"
-#include "webrtc/api/rtpreceiverinterface.h"
 #include "webrtc/base/asyncinvoker.h"
 #include "webrtc/base/asyncudpsocket.h"
 #include "webrtc/base/criticalsection.h"
@@ -492,8 +491,6 @@
   // Get statistics about the current media session.
   bool GetStats(VoiceMediaInfo* stats);
 
-  std::vector<webrtc::RtpSource> GetSources(uint32_t ssrc) const;
-
   // Monitoring functions
   sigslot::signal2<VoiceChannel*, const std::vector<ConnectionInfo>&>
       SignalConnectionMonitor;
@@ -535,6 +532,7 @@
   void HandleEarlyMediaTimeout();
   bool InsertDtmf_w(uint32_t ssrc, int event, int duration);
   bool SetOutputVolume_w(uint32_t ssrc, double volume);
+  bool GetStats_w(VoiceMediaInfo* stats);
 
   void OnMessage(rtc::Message* pmsg) override;
   void GetSrtpCryptoSuites_n(std::vector<int>* crypto_suites) const override;