Date/Time: Revert unintended changes from [45882].

Props TimothyBlynJacobs.
See #25768.

git-svn-id: https://develop.svn.wordpress.org/trunk@45884 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/functions.php

@@ -1567,40 +1567,6 @@ function do_robots() {
 	echo apply_filters( 'robots_txt', $output, $public );
 }
 
-/**
- * Display the robots.txt file content.
- *
- * The echo content should be with usage of the permalinks or for creating the
- * robots.txt file.
- *
- * @since 5.3.0
- */
-function do_favicon() {
-	/**
-	 * Fires when serving the favicon.ico file.
-	 *
-	 * @since 5.3.0
-	 */
-	do_action( 'do_faviconico' );
-
-	wp_safe_redirect( esc_url( get_site_icon_url( 32, admin_url( 'images/w-logo-blue.png' ) ) ) );
-
-}
-
-/**
- * Don't load all of WordPress when handling a favicon.ico request.
- *
- * Instead, send the headers for a zero-length favicon and bail.
- *
- * @since 3.0.0
- */
-function wp_favicon_request() {
-	if ( '/favicon.ico' == $_SERVER['REQUEST_URI'] ) {
-		header( 'Content-Type: image/vnd.microsoft.icon' );
-		exit;
-	}
-}
-
 /**
  * Determines whether WordPress is already installed.
  *