Get rid of ICustomizableSkin

As far as I can tell this interface is entirely unused.

Change-Id: I9f2ff27ab0e7f9f1e842d5e073eed5d9428f3cda

includes/skins/ICustomizableSkin.php

@@ -1,34 +0,0 @@
-<?php
-/**
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- * http://www.gnu.org/copyleft/gpl.html
- *
- * @file
- */
-
-interface ICustomizableSkin {
-	/**
-	 * override an existing option or options with new values
-	 * @param array $options
-	 */
-	public function setSkinOptions( $options );
-
-	/**
-	 * Return whether a skin option is truthy
-	 * @param string $key
-	 * @return bool
-	 */
-	public function getSkinOption( $key );
-}

includes/skins/SkinMinerva.php

@@ -27,7 +27,7 @@ use MediaWiki\Minerva\SkinUserPageHelper;
  * A skin that works on both desktop and mobile
  * @ingroup Skins
  */
-class SkinMinerva extends SkinTemplate implements ICustomizableSkin {
+class SkinMinerva extends SkinTemplate {
 	/** Set of keys for available skin options. See $skinOptions. */
 	const OPTION_MOBILE_OPTIONS = 'mobileOptionsLink';
 	const OPTION_CATEGORIES = 'categories';

skin.json

@@ -6,7 +6,6 @@
 		"MinervaTemplate": "includes/skins/MinervaTemplate.php",
 		"SkinMinerva": "includes/skins/SkinMinerva.php",
 		"SkinMinervaNeue": "includes/skins/SkinMinerva.php",
-		"ICustomizableSkin": "includes/skins/ICustomizableSkin.php",
 		"MediaWiki\\Minerva\\MenuBuilder": "includes/skins/MenuBuilder.php",
 		"MediaWiki\\Minerva\\MenuEntry": "includes/skins/MenuEntry.php",
 		"MediaWiki\\Minerva\\ResourceLoaderLessVarFileModule": "includes/ResourceLoaderLessVarFileModule.php",