[cast_channel] Clean up CastSocketImpl ctor parameters

components/cast_channel/cast_channel_enum.h

Index: components/cast_channel/cast_channel_enum.h
diff --git a/components/cast_channel/cast_channel_enum.h b/components/cast_channel/cast_channel_enum.h
index 31117983c2830667269c4719c0c032b2cb25e893..1ccf670d682e9411f2487fceb788ef8706e7af71 100644
--- a/components/cast_channel/cast_channel_enum.h
+++ b/components/cast_channel/cast_channel_enum.h
@@ -41,12 +41,6 @@ enum class ChannelError {
   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,
@@ -144,7 +138,6 @@ enum class WriteState {
 
 std::string ReadyStateToString(ReadyState ready_state);
 std::string ChannelErrorToString(ChannelError channel_error);
-std::string ChannelAuthTypeToString(ChannelAuthType channel_auth);
 
 }  // namespace cast_channel