This is in order to apply `browse-url-transform-alist'.
* lisp/net/browse-url.el (browse-url-with-browser-kind)
(browse-url-button-open, browse-url-button-open-url):
* lisp/net/shr.el (shr-browse-url):
* lisp/net/eww.el (eww-browse-with-external-browser):
* lisp/gnus/gnus-sum.el (gnus-summary-browse-url):
* lisp/emacs-lisp/package.el (package-browse-url): Let-bind
`browse-url-browser-function' and call `browse-url'.