Remove channel ids from various interfaces.

webrtc/test/channel_transport/udp_transport_impl.h

Index: webrtc/test/channel_transport/udp_transport_impl.h
diff --git a/webrtc/test/channel_transport/udp_transport_impl.h b/webrtc/test/channel_transport/udp_transport_impl.h
index 5dbf5d891360320ebaba00f3085fd8e39810db9f..cbc53bcbb2d972ae459252867a8db4ce0d3f0729 100644
--- a/webrtc/test/channel_transport/udp_transport_impl.h
+++ b/webrtc/test/channel_transport/udp_transport_impl.h
@@ -116,8 +116,8 @@ public:
                              size_t length,
                              uint16_t rtcpPort) override;
     // Transport functions
-    int SendPacket(int channel, const void* data, size_t length) override;
-    int SendRTCPPacket(int channel, const void* data, size_t length) override;
+    int SendPacket(const void* data, size_t length) override;
+    int SendRTCPPacket(const void* data, size_t length) override;
 
     // UdpTransport functions continue.
     int32_t SetSendIP(const char* ipaddr) override;