$key is not needed for registering contactsmanager callbacks

lib/private/contactsmanager.php

@@ -143,12 +143,11 @@ namespace OC {
 		 * In order to improve lazy loading a closure can be registered which will be called in case
 		 * address books are actually requested
 		 *
-		 * @param string $key
 		 * @param \Closure $callable
 		 */
-		public function register($key, \Closure $callable)
+		public function register(\Closure $callable)
 		{
-			$this->address_book_loaders[$key] = $callable;
+			$this->address_book_loaders[] = $callable;
 		}
 
 		/**

lib/public/contacts/imanager.php

@@ -138,11 +138,10 @@ namespace OCP\Contacts {
 		 * In order to improve lazy loading a closure can be registered which will be called in case
 		 * address books are actually requested
 		 *
-		 * @param string $key
 		 * @param \Closure $callable
 		 * @return void
 		 */
-		function register($key, \Closure $callable);
+		function register(\Closure $callable);
 
 		/**
 		 * @return array