[cast_channel] Clean up CastSocketImpl ctor parameters

components/cast_channel/cast_transport.h

Index: components/cast_channel/cast_transport.h
diff --git a/components/cast_channel/cast_transport.h b/components/cast_channel/cast_transport.h
index bbb6158b14abc46b2486e2ef56c660ee39d04c60..efb12ad9da29bba0a0185f0e7a5357c9750a0d2c 100644
--- a/components/cast_channel/cast_transport.h
+++ b/components/cast_channel/cast_transport.h
@@ -71,7 +71,6 @@ class CastTransport {
 // Manager class for reading and writing messages to/from a socket.
 class CastTransportImpl : public CastTransport {
  public:
-  using ChannelAuthType = ::cast_channel::ChannelAuthType;
   using ChannelError = ::cast_channel::ChannelError;
 
   // Adds a CastMessage read/write layer to a socket.
@@ -83,7 +82,6 @@ class CastTransportImpl : public CastTransport {
   CastTransportImpl(net::Socket* socket,
                     int channel_id,
                     const net::IPEndPoint& ip_endpoint_,
-                    ChannelAuthType channel_auth_,
                     scoped_refptr<Logger> logger);
 
   ~CastTransportImpl() override;
@@ -184,9 +182,6 @@ class CastTransportImpl : public CastTransport {
   // IP address of the remote end.
   const net::IPEndPoint ip_endpoint_;
 
-  // Authentication level for the connection.
-  ChannelAuthType channel_auth_;
-
   // Accumulates details of events and errors, for debugging purposes.
   scoped_refptr<Logger> logger_;