pkg/scheduled_test fixed shelf dependency

pkg/scheduled_test/test/scheduled_server_test.dart

Index: pkg/scheduled_test/test/scheduled_server_test.dart
diff --git a/pkg/scheduled_test/test/scheduled_server_test.dart b/pkg/scheduled_test/test/scheduled_server_test.dart
index 9b92820222cc3952ac65494b09431161b5367bc1..53e4ac17aa0b1457130a650de8f42c7b14509489 100644
--- a/pkg/scheduled_test/test/scheduled_server_test.dart
+++ b/pkg/scheduled_test/test/scheduled_server_test.dart
@@ -191,7 +191,7 @@ void main(_, message) {
 
 /// Creates a metatest that runs [testBody], captures its schedule errors, and
 /// asserts that it throws an error with the given [errorMessage].
-void expectServerError(String description, void testBody(),
+void expectServerError(String description, testBody(),
     String errorMessage) {
   expectTestFails(description, testBody, (errors) {
     // There can be between one and three errors here. The first is the