Don't implicitly run "pub get".

test/serve/gets_first_if_git_ref_changed_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.
 
 library pub_tests;
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';
 
@@ skipping 19 matching lines @@
       "foo": {"git": {"url": "../foo.git", "ref": commit1}}
     }).create();
 
     pubGet();
 
     // Change the commit in the pubspec.
     d.appDir({
       "foo": {"git": {"url": "../foo.git", "ref": commit2}}
     }).create();
 
-    pubServe(shouldGetFirst: true);
+    pubGet();
+    pubServe();
     requestShouldSucceed("packages/foo/foo.dart", 'main() => "after";');
     endPubServe();
   });
 }