Revert of Adding the ability to create an RtpSender without a track.

talk/app/webrtc/peerconnection.h

Index: talk/app/webrtc/peerconnection.h
diff --git a/talk/app/webrtc/peerconnection.h b/talk/app/webrtc/peerconnection.h
index c233388343ec5950ea0f1dcdd0ef51fc9c5e22eb..2d388ae9f913912990af0541dd8eae67008da745 100644
--- a/talk/app/webrtc/peerconnection.h
+++ b/talk/app/webrtc/peerconnection.h
@@ -91,9 +91,6 @@
   rtc::scoped_refptr<DtmfSenderInterface> CreateDtmfSender(
       AudioTrackInterface* track) override;
 
-  rtc::scoped_refptr<RtpSenderInterface> CreateSender(
-      const std::string& kind) override;
-
   std::vector<rtc::scoped_refptr<RtpSenderInterface>> GetSenders()
       const override;
   std::vector<rtc::scoped_refptr<RtpReceiverInterface>> GetReceivers()
@@ -190,6 +187,12 @@
                             AudioTrackInterface* audio_track);
   void DestroyVideoReceiver(MediaStreamInterface* stream,
                             VideoTrackInterface* video_track);
+  void CreateAudioSender(MediaStreamInterface* stream,
+                         AudioTrackInterface* audio_track,
+                         uint32_t ssrc);
+  void CreateVideoSender(MediaStreamInterface* stream,
+                         VideoTrackInterface* video_track,
+                         uint32_t ssrc);
   void DestroyAudioSender(MediaStreamInterface* stream,
                           AudioTrackInterface* audio_track,
                           uint32_t ssrc);
@@ -324,8 +327,6 @@
   // webrtc::DataChannel should be opened.
   void OnDataChannelOpenMessage(const std::string& label,
                                 const InternalDataChannelInit& config);
-
-  RtpSenderInterface* FindSenderById(const std::string& id);
 
   std::vector<rtc::scoped_refptr<RtpSenderInterface>>::iterator
   FindSenderForTrack(MediaStreamTrackInterface* track);