Make corelib_strong tests strong-mode compliant

tests/corelib_strong/list_set_all_test.dart

Index: tests/corelib_strong/list_set_all_test.dart
diff --git a/tests/corelib_strong/list_set_all_test.dart b/tests/corelib_strong/list_set_all_test.dart
index 50be8b3c9c5dcee334a17e99b434c9d25037dfe7..7214952ddf523d861b2665062c2472a35b678e80 100644
--- a/tests/corelib_strong/list_set_all_test.dart
+++ b/tests/corelib_strong/list_set_all_test.dart
@@ -88,10 +88,10 @@ main() {
   expectUE(() => test(const [1, 2, 3], 1, [4, 5, 6]));
 }
 
-void expectRE(Function f) {
+void expectRE(void f()) {
   Expect.throws(f, (e) => e is RangeError);
 }
 
-void expectUE(Function f) {
+void expectUE(void f()) {
   Expect.throws(f, (e) => e is UnsupportedError);
 }