db/DatabaseSimple: remove obsolete header

src/Main.cxx

@@ -68,7 +68,6 @@
 #ifdef ENABLE_DATABASE
 #include "db/update/Service.hxx"
 #include "db/DatabaseGlue.hxx"
-#include "db/DatabaseSimple.hxx"
 #include "db/plugins/SimpleDatabasePlugin.hxx"
 #include "storage/Configured.hxx"
 #include "storage/CompositeStorage.hxx"

src/db/DatabaseSimple.hxx

@@ -1,47 +0,0 @@
-/*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
- * http://www.musicpd.org
- *
- * 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.
- */
-
-#ifndef MPD_DATABASE_SIMPLE_HXX
-#define MPD_DATABASE_SIMPLE_HXX
-
-#include "Compiler.h"
-
-struct config_param;
-struct Directory;
-class SimpleDatabase;
-class Error;
-
-/**
- * Check whether the default #SimpleDatabasePlugin is used.  This
- * allows using db_get_root(), db_save(), db_get_mtime() and
- * db_exists().
- */
-bool
-db_is_simple(void);
-
-/**
- * Returns true if there is a valid database file on the disk.
- *
- * May only be used if db_is_simple() returns true.
- */
-gcc_pure
-bool
-db_exists();
-
-#endif