Cannot close DB in db.executeSql() callback

[brodybits]

The following test fails, reproducing the issue:

        if (!isWebSql) test(suiteName +
            ' close DB in db.executeSql() callback', function () {

          // async test coming up
          stop(1);

          var dbName = "Close-DB-in-db-executeSql-callback.db";
          openDatabase({name: dbName}, function (db) {
            db.executeSql("CREATE TABLE IF NOT EXISTS tt (test_data)", [], function() {
              db.close(function () {
                ok(true, 'DB close OK');
                start(1);
              }, function (error) {
                ok(false, "Could not close DB: " + error.message);
                start(1);
              });
            });
          }, function (error) {
            ok(false, error.message);
            start(1);
          });
        });

I discovered this issue while making some tests for the new version for sqlcipher.