Fix the async compiler, and pub's async compiler test.

sdk/lib/_internal/pub_generated/test/async_compile_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:io';
 
 import 'package:path/path.dart' as p;
 import 'package:scheduled_test/descriptor.dart' as d;
 import 'package:scheduled_test/scheduled_test.dart';
 import 'package:scheduled_test/scheduled_process.dart';
 
 import 'test_pub.dart';
 import '../lib/src/io.dart';
 
 void main() {
   integration("the generated pub source is up to date", () {
     var compilerArgs = Platform.executableArguments.toList()..addAll(
         [
             p.join(pubRoot, 'bin', 'async_compile.dart'),
             '--force',
             '--verbose',
-            '--no-snapshot',
-            p.join(sandboxDir, "pub_generated"),
-            p.join(sandboxDir, "build")]);
+            p.join(sandboxDir, "pub_generated")]);
 
     new ScheduledProcess.start(Platform.executable, compilerArgs).shouldExit(0);
 
     new d.DirectoryDescriptor.fromFilesystem(
         "pub_generated",
         p.join(pubRoot, "..", "pub_generated")).validate();
   });
 }