[evolution] Remove unused function prototype declaration

[Milan Crha <mcrha src gnome org>]

commit f767d5ac1433ad76a4953da0c27cc7228c2beeec
Author: Milan Crha <mcrha redhat com>
Date:   Tue Sep 1 17:25:00 2020 +0200

    Remove unused function prototype declaration

 src/modules/mail/e-mail-shell-view-private.h | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/src/modules/mail/e-mail-shell-view-private.h b/src/modules/mail/e-mail-shell-view-private.h
index 3725b10a1d..512003654a 100644
--- a/src/modules/mail/e-mail-shell-view-private.h
+++ b/src/modules/mail/e-mail-shell-view-private.h
@@ -164,8 +164,6 @@ void                e_mail_shell_view_update_sidebar
                                        (EMailShellView *mail_shell_view);
 void           e_mail_shell_view_update_send_receive_menus
                                        (EMailShellView *mail_shell_view);
-GDBusProxy *   e_mail_shell_view_get_web_extension_proxy
-                                       (EMailShellView *mail_shell_view);
 void           e_mail_shell_view_rename_folder
                                        (EMailShellView *mail_shell_view);