Remove some compat code from url.el

* lisp/url/url.el (url-warn): Make into obsolete alias for
display-warning.
* lisp/url/url-auth.el (url-register-auth-scheme):
* lisp/url/url-news.el (url-news-open-host):
* lisp/url/url-proxy.el (url-find-proxy-for-url): Adjust callers.

lisp/url/url-auth.el

@@ -23,7 +23,6 @@
 
 (require 'url-vars)
 (require 'url-parse)
-(autoload 'url-warn "url")
 (autoload 'auth-source-search "auth-source")
 
 (defsubst url-auth-user-prompt (url realm)
@@ -540,7 +539,7 @@ RATING   a rating between 1 and 10 of the strength of the authentication.
 		  (t rating)))
 	 (node (assoc type url-registered-auth-schemes)))
     (if (not (fboundp function))
-	(url-warn
+        (display-warning
 	 'security
 	 (format-message
 	  "Tried to register `%s' as an auth scheme, but it is not a function!"

lisp/url/url-news.el

@@ -25,7 +25,6 @@
 (require 'url-util)
 (require 'url-parse)
 (require 'nntp)
-(autoload 'url-warn "url")
 (autoload 'gnus-group-read-ephemeral-group "gnus-group")
 
 ;; Unused.
@@ -42,7 +41,7 @@
 	(nntp-send-command "^.*\r?\n" "AUTHINFO USER" user)
 	(nntp-send-command "^.*\r?\n" "AUTHINFO PASS" pass)
 	(if (not (nntp-server-opened host))
-	    (url-warn 'url (format "NNTP authentication to `%s' as `%s' failed"
+            (display-warning 'url (format "NNTP authentication to `%s' as `%s' failed"
 				   host user))))))
 
 (defun url-news-fetch-message-id (host message-id)

lisp/url/url-proxy.el

@@ -22,7 +22,6 @@
 ;;; Code:
 
 (require 'url-parse)
-(autoload 'url-warn "url")
 
 (defun url-default-find-proxy-for-url (urlobj host)
   (cond
@@ -60,7 +59,7 @@
      ((string-match "^socks +" proxy)
       (concat "socks://" (substring proxy (match-end 0))))
      (t
-      (url-warn 'url (format "Unknown proxy directive: %s" proxy) 'critical)
+      (display-warning 'url (format "Unknown proxy directive: %s" proxy) 'critical)
       nil))))
 
 (autoload 'url-http "url-http")

lisp/url/url.el

@@ -365,19 +365,7 @@ how long to wait for a response before giving up."
       (if (buffer-live-p buff)
 	  (kill-buffer buff)))))
 
-(cond
- ((fboundp 'display-warning)
-  (defalias 'url-warn 'display-warning))
- ((fboundp 'warn)
-  (defun url-warn (class message &optional level)
-    (warn "(%s/%s) %s" class (or level 'warning) message)))
- (t
-  (defun url-warn (class message &optional level)
-    (with-current-buffer (get-buffer-create "*URL-WARNINGS*")
-      (goto-char (point-max))
-      (save-excursion
-	(insert (format "(%s/%s) %s\n" class (or level 'warning) message)))
-      (display-buffer (current-buffer))))))
+(define-obsolete-function-alias 'url-warn #'display-warning "28.1")
 
 (provide 'url)