net/SocketError: remove obsolete Error functions

src/net/SocketError.cxx

@@ -19,13 +19,10 @@
 
 #include "config.h"
 #include "SocketError.hxx"
-#include "util/Domain.hxx"
 #include "util/Macros.hxx"
 
 #include <string.h>
 
-const Domain socket_domain("socket");
-
 #ifdef WIN32
 
 SocketErrorMessage::SocketErrorMessage(socket_error_t code)

src/net/SocketError.hxx

@@ -22,7 +22,6 @@
 
 #include "Compiler.h"
 #include "system/Error.hxx"
-#include "util/Error.hxx" // IWYU pragma: export
 
 #ifdef WIN32
 #include <winsock2.h>
@@ -32,14 +31,6 @@ typedef DWORD socket_error_t;
 typedef int socket_error_t;
 #endif
 
-class Domain;
-
-/**
- * A #Domain for #Error for socket I/O errors.  The code is an errno
- * value (or WSAGetLastError() on Windows).
- */
-extern const Domain socket_domain;
-
 gcc_pure
 static inline socket_error_t
 GetSocketError()
@@ -108,35 +99,6 @@ public:
 	}
 };
 
-static inline void
-SetSocketError(Error &error, socket_error_t code)
-{
-	const SocketErrorMessage msg(code);
-	error.Set(socket_domain, code, msg);
-}
-
-static inline void
-SetSocketError(Error &error)
-{
-	SetSocketError(error, GetSocketError());
-}
-
-gcc_const
-static inline Error
-NewSocketError(socket_error_t code)
-{
-	Error error;
-	SetSocketError(error, code);
-	return error;
-}
-
-gcc_pure
-static inline Error
-NewSocketError()
-{
-	return NewSocketError(GetSocketError());
-}
-
 gcc_const
 static inline std::system_error
 MakeSocketError(socket_error_t code, const char *msg)