deleteDefaultMessages.php

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<?php
require_once( __DIR__ . '/Maintenance.php' );

class DeleteDefaultMessages extends Maintenance {
        public function __construct() {
                parent::__construct();
                $this->mDescription = "Deletes all pages in the MediaWiki namespace" .
                                                                " which were last edited by \"MediaWiki default\"";
        }

        public function execute() {
                global $wgUser;

                $this->output( "Checking existence of old default messages..." );
                $dbr = wfGetDB( DB_SLAVE );
                $res = $dbr->select( array( 'page', 'revision' ),
                        array( 'page_namespace', 'page_title' ),
                        array(
                                'page_namespace' => NS_MEDIAWIKI,
                                'page_latest=rev_id',
                                'rev_user_text' => 'MediaWiki default',
                        )
                );

                if( $dbr->numRows( $res ) == 0 ) {
                        # No more messages left
                        $this->output( "done.\n" );
                        return;
                }

                # Deletions will be made by $user temporarly added to the bot group
                # in order to hide it in RecentChanges.
                $user = User::newFromName( 'MediaWiki default' );
                if ( !$user ) {
                        $this->error( "Invalid username", true );
                }
                $user->addGroup( 'bot' );
                $wgUser = $user;

                # Handle deletion
                $this->output( "\n...deleting old default messages (this may take a long time!)...", 'msg' );
                $dbw = wfGetDB( DB_MASTER );

                foreach ( $res as $row ) {
                        wfWaitForSlaves();
                        $dbw->ping();
                        $title = Title::makeTitle( $row->page_namespace, $row->page_title );
                        $page = WikiPage::factory( $title );
                        $dbw->begin( __METHOD__ );
                        $error = ''; // Passed by ref
                        $page->doDeleteArticle( 'No longer required', false, 0, false, $error, $user );
                        $dbw->commit( __METHOD__ );
                }

                $this->output( "done!\n", 'msg' );
        }
}

$maintClass = "DeleteDefaultMessages";
require_once( RUN_MAINTENANCE_IF_MAIN );