Don't implicitly run "pub get".

test/dart2js/supports_valid_options_test.dart

Index: test/dart2js/supports_valid_options_test.dart
diff --git a/test/dart2js/supports_valid_options_test.dart b/test/dart2js/supports_valid_options_test.dart
index ec02f4dd19cff2d88b1dc7e5bb7ed70d5968561c..7ced80766b21f83a5e333ae766678f71660ad4a8 100644
--- a/test/dart2js/supports_valid_options_test.dart
+++ b/test/dart2js/supports_valid_options_test.dart
@@ -34,8 +34,10 @@ main() {
       ])
     ]).create();
 
+    pubGet();
+
     // None of these options should be rejected, either by pub or by dart2js.
-    pubServe(shouldGetFirst: true);
+    pubServe();
     requestShouldSucceed("main.dart.js", isNot(isEmpty));
     endPubServe();
   });