Move ownership of send ViEChannels and ViEEncoder to VideoSendStream.

webrtc/video_engine/vie_channel.cc

Index: webrtc/video_engine/vie_channel.cc
diff --git a/webrtc/video_engine/vie_channel.cc b/webrtc/video_engine/vie_channel.cc
index 84a86f873513a7870ee07cbfefa8abb398011c07..58fafea4df477e590643ff3defcf0f4ea17217c3 100644
--- a/webrtc/video_engine/vie_channel.cc
+++ b/webrtc/video_engine/vie_channel.cc
@@ -725,9 +725,8 @@ int32_t ViEChannel::GetLocalSSRC(uint8_t idx, unsigned int* ssrc) {
   return 0;
 }
 
-int32_t ViEChannel::GetRemoteSSRC(uint32_t* ssrc) {
-  *ssrc = vie_receiver_.GetRemoteSsrc();
-  return 0;
+uint32_t ViEChannel::GetRemoteSSRC() {
+  return vie_receiver_.GetRemoteSsrc();
 }
 
 int ViEChannel::SetRtxSendPayloadType(int payload_type,