Remove channel ids from various interfaces.

talk/media/webrtc/webrtcvoiceengine.h

Index: talk/media/webrtc/webrtcvoiceengine.h
diff --git a/talk/media/webrtc/webrtcvoiceengine.h b/talk/media/webrtc/webrtcvoiceengine.h
index e8ae1575964ca3650cdf6e2b93d74948df8507c3..ba9b8d56a7bcbdbfbdabc15fb3fb575ff0584f96 100644
--- a/talk/media/webrtc/webrtcvoiceengine.h
+++ b/talk/media/webrtc/webrtcvoiceengine.h
@@ -340,13 +340,13 @@ class WebRtcVoiceMediaChannel : public VoiceMediaChannel,
                          VoiceMediaChannel::Error* error) override;
 
   // implements Transport interface
-  int SendPacket(int channel, const void* data, size_t len) override {
+  int SendPacket(const void* data, size_t len) override {
     rtc::Buffer packet(reinterpret_cast<const uint8_t*>(data), len,
                        kMaxRtpPacketLen);
     return VoiceMediaChannel::SendPacket(&packet) ? static_cast<int>(len) : -1;
   }
 
-  int SendRTCPPacket(int channel, const void* data, size_t len) override {
+  int SendRTCPPacket(const void* data, size_t len) override {
     rtc::Buffer packet(reinterpret_cast<const uint8_t*>(data), len,
                        kMaxRtpPacketLen);
     return VoiceMediaChannel::SendRtcp(&packet) ? static_cast<int>(len) : -1;