Also remove GeSHi class

I think two years is more than long enough for this one too

Change-Id: I6dd34c3fd60d6ade0206bc3d62759d87359c0b7a

extension.json

@@ -26,7 +26,6 @@
 	},
 	"AutoloadClasses": {
 		"SyntaxHighlight": "includes/SyntaxHighlight.php",
-		"GeSHi": "includes/GeSHi.php",
 		"SyntaxHighlightAce": "includes/SyntaxHighlightAce.php",
 		"SyntaxHighlightGeSHiCompat": "includes/SyntaxHighlightGeSHiCompat.php",
 		"ResourceLoaderSyntaxHighlightVisualEditorModule": "includes/ResourceLoaderSyntaxHighlightVisualEditorModule.php"

includes/GeSHi.php

@@ -1,42 +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
- */
-
-/**
- * Stub class for maintaining backward-compatibility with extensions
- * that have not been updated for version 2.0 of SyntaxHighlight_GeSHi.
- */
-class GeSHi {
-
-	private $html;
-
-	public function __construct( $html ) {
-		$this->html = $html;
-	}
-
-	public function error() {
-	}
-
-	public function set_language( $language ) {
-	}
-
-	public function parse_code() {
-		global $wgOut;
-		$wgOut->addModuleStyles( 'ext.pygments' );
-		return $this->html;
-	}
-}