Fix imports.

Author: rkistner

test/basic_test.dart

@@ -1,11 +1,9 @@
 import 'dart:async';
 import 'dart:math';
-import 'dart:typed_data';
 
 import 'package:sqlite3/sqlite3.dart' as sqlite;
 import 'package:sqlite_async/mutex.dart';
 import 'package:sqlite_async/sqlite_async.dart';
-import 'package:test/expect.dart';
 import 'package:test/test.dart';
 
 import 'util.dart';