Remove deprecated code from beta 16 (#2705)

src/Extend/ApiSerializer.php

@@ -74,28 +74,6 @@ class ApiSerializer implements ExtenderInterface
         return $this;
     }
 
-    /**
-     * Add to or modify the attributes array of this serializer.
-     *
-     * @param callable|string $callback
-     *
-     * The callback can be a closure or an invokable class, and should accept:
-     * - $serializer: An instance of this serializer.
-     * - $model: An instance of the model being serialized.
-     * - $attributes: An array of existing attributes.
-     *
-     * The callable should return:
-     * - An array of additional attributes to merge with the existing array.
-     *   Or a modified $attributes array.
-     *
-     * @deprecated in beta 16, removed in beta 17
-     * @return self
-     */
-    public function mutate($callback)
-    {
-        return $this->attributes($callback);
-    }
-
     /**
      * Establish a simple hasOne relationship from this serializer to another serializer.
      * This represents a one-to-one relationship.

src/Extend/Compat.php

@@ -1,37 +0,0 @@
-<?php
-
-/*
- * This file is part of Flarum.
- *
- * For detailed copyright and license information, please view the
- * LICENSE file that was distributed with this source code.
- */
-
-namespace Flarum\Extend;
-
-use Flarum\Extension\Extension;
-use Illuminate\Contracts\Container\Container;
-
-/**
- * This class is used to wrap old bootstrap.php closures (as used in versions up
- * to 0.1.0-beta7) in the new Extender format.
- *
- * This gives extensions the chance to work with the new API without making any
- * changes, and have some time to convert to the pure usage of extenders.
- *
- * @deprecated
- */
-class Compat implements ExtenderInterface
-{
-    private $callback;
-
-    public function __construct($callback)
-    {
-        $this->callback = $callback;
-    }
-
-    public function extend(Container $container, Extension $extension = null)
-    {
-        $container->call($this->callback);
-    }
-}