Drop the UserLoadFromSession hook, deprecated in 1.27

Change-Id: Ic86d9ee1fe6763270e79e31296ecd027e5d41be2

RELEASE-NOTES-1.34

@@ -238,6 +238,7 @@ because of Phabricator reports.
   UserGroupsChanged hook.
 * Skin::getDefaultInstance(), deprecated in 1.27, has been removed. Get the
   instance from MediaWikiServices instead.
+* The UserLoadFromSession hook, deprecated in 1.27, has been removed.
 * …
 
 === Deprecations in 1.34 ===

docs/hooks.txt

@@ -3744,14 +3744,6 @@ $name: user name
 $user: user object
 &$s: database query object
 
-'UserLoadFromSession': DEPRECATED since 1.27! Create a
-MediaWiki\Session\SessionProvider instead.
-Called to authenticate users on external/environmental means; occurs before
-session is loaded.
-$user: user object being loaded
-&$result: set this to a boolean value to abort the normal authentication
-  process
-
 'UserLoadOptions': When user options/preferences are being loaded from the
 database.
 $user: User object

includes/user/User.php

@@ -1346,13 +1346,6 @@ class User implements IDBAccessObject, UserIdentity {
 	 * @return bool True if the user is logged in, false otherwise.
 	 */
 	private function loadFromSession() {
-		// Deprecated hook
-		$result = null;
-		Hooks::run( 'UserLoadFromSession', [ $this, &$result ], '1.27' );
-		if ( $result !== null ) {
-			return $result;
-		}
-
 		// MediaWiki\Session\Session already did the necessary authentication of the user
 		// returned here, so just use it if applicable.
 		$session = $this->getRequest()->getSession();