[cast_channel] Clean up CastSocketImpl ctor parameters

components/cast_channel/cast_channel_enum.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_CAST_CHANNEL_CAST_CHANNEL_ENUM_H_
 #define COMPONENTS_CAST_CHANNEL_CAST_CHANNEL_ENUM_H_
 
 #include <string>
 
 namespace cast_channel {
@@ skipping 23 matching lines @@
   CONNECT_ERROR,
   CAST_SOCKET_ERROR,
   TRANSPORT_ERROR,
   INVALID_MESSAGE,
   INVALID_CHANNEL_ID,
   CONNECT_TIMEOUT,
   PING_TIMEOUT,
   UNKNOWN,
 };
 
-// Maps to enum ChannelAuth in cast_channel.idl
-enum class ChannelAuthType {
-  NONE,
-  SSL_VERIFIED,
-};
-
 // Used in ErrorInfo.eventType in cast_channel.idl
 enum class ChannelEvent {
   UNKNOWN = 0,
   CAST_SOCKET_CREATED,
   READY_STATE_CHANGED,
   CONNECTION_STATE_CHANGED,
   READ_STATE_CHANGED,
   WRITE_STATE_CHANGED,
   ERROR_STATE_CHANGED,
   CONNECT_FAILED,
@@ skipping 77 matching lines @@
   WRITE,
   WRITE_COMPLETE,
   DO_CALLBACK,
   HANDLE_ERROR,
   WRITE_ERROR,  // Terminal states here and below.
   IDLE,
 };
 
 std::string ReadyStateToString(ReadyState ready_state);
 std::string ChannelErrorToString(ChannelError channel_error);
-std::string ChannelAuthTypeToString(ChannelAuthType channel_auth);
 
 }  // namespace cast_channel
 
 #endif  // COMPONENTS_CAST_CHANNEL_CAST_CHANNEL_ENUM_H_