Revert of Completed the functionalities of SrtpTransport.

pc/rtptransport.h

Index: pc/rtptransport.h
diff --git a/pc/rtptransport.h b/pc/rtptransport.h
index 5e1aa20a1f7c0c74f1a88dbec1c72f6d6503501e..373eaa77ee1340319f989c3dbdce8555f40a6625 100644
--- a/pc/rtptransport.h
+++ b/pc/rtptransport.h
@@ -56,13 +56,10 @@ class RtpTransport : public RtpTransportInternal {
 
   bool IsWritable(bool rtcp) const override;
 
-  bool SendRtpPacket(rtc::CopyOnWriteBuffer* packet,
-                     const rtc::PacketOptions& options,
-                     int flags) override;
-
-  bool SendRtcpPacket(rtc::CopyOnWriteBuffer* packet,
-                      const rtc::PacketOptions& options,
-                      int flags) override;
+  bool SendPacket(bool rtcp,
+                  rtc::CopyOnWriteBuffer* packet,
+                  const rtc::PacketOptions& options,
+                  int flags) override;
 
   bool HandlesPayloadType(int payload_type) const override;
 
@@ -83,11 +80,6 @@ class RtpTransport : public RtpTransportInternal {
 
   void MaybeSignalReadyToSend();
 
-  bool SendPacket(bool rtcp,
-                  rtc::CopyOnWriteBuffer* packet,
-                  const rtc::PacketOptions& options,
-                  int flags);
-
   void OnReadPacket(rtc::PacketTransportInternal* transport,
                     const char* data,
                     size_t len,