Fix a bunch of pub tests that started running "pub get".

test/dart2js/minifies_in_release_mode_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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 '../descriptor.dart' as d;
 import '../test_pub.dart';
 import '../serve/utils.dart';
 
 main() {
   integration("generates minified JS in release mode", () {
     d.dir(appPath, [
       d.appPubspec(),
       d.dir("web", [
         d.file("main.dart", "void main() => print('hello');")
       ])
     ]).create();
 
-    pubServe(args: ["--mode", "release"]);
+    pubServe(args: ["--mode", "release"], shouldGetFirst: true);
     requestShouldSucceed("main.dart.js", isMinifiedDart2JSOutput);
     endPubServe();
   });
 }