Format all tests.

tests/lib/async/stack_trace24_test.dart

Index: tests/lib/async/stack_trace24_test.dart
diff --git a/tests/lib/async/stack_trace24_test.dart b/tests/lib/async/stack_trace24_test.dart
index 929b42d561cc8cf461c8270e749af1ca55246151..81fa3d2e26437300bea93669e5a8ef987dc638e2 100644
--- a/tests/lib/async/stack_trace24_test.dart
+++ b/tests/lib/async/stack_trace24_test.dart
@@ -13,14 +13,14 @@ main() {
     controller.close();
   });
   asyncStart();
-  controller.stream
-    .map((e) { throw "error"; })
-    .listen((_) { throw "should never be reached"; },
-      onError: (e, st) {
-        Expect.equals("error", e);
-        Expect.isNotNull(st);
-      },
-      onDone: () {
-        asyncEnd();
-      });
+  controller.stream.map((e) {
+    throw "error";
+  }).listen((_) {
+    throw "should never be reached";
+  }, onError: (e, st) {
+    Expect.equals("error", e);
+    Expect.isNotNull(st);
+  }, onDone: () {
+    asyncEnd();
+  });
 }