Don't implicitly run "pub get".

test/run/app_can_read_from_stdin_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 '../descriptor.dart' as d;
 import '../test_pub.dart';
 
 const SCRIPT = """
 import 'dart:io';
 
 main() {
   print("started");
   var line1 = stdin.readLineSync();
   print("between");
   var line2 = stdin.readLineSync();
   print(line1);
   print(line2);
 }
 """;
 
 main() {
   integration('the spawned application can read from stdin', () {
     d.dir(appPath, [
       d.appPubspec(),
       d.dir("bin", [
         d.file("script.dart", SCRIPT)
       ])
     ]).create();
 
-    var pub = pubRun(args: ["bin/script"], shouldGetFirst: true);
+    pubGet();
+    var pub = pubRun(args: ["bin/script"]);
 
     pub.stdout.expect("started");
     pub.writeLine("first");
     pub.stdout.expect("between");
     pub.writeLine("second");
     pub.stdout.expect("first");
     pub.stdout.expect("second");
     pub.shouldExit(0);
   });
 }