Format all tests.

tests/lib/async/stack_trace12_test.dart

Index: tests/lib/async/stack_trace12_test.dart
diff --git a/tests/lib/async/stack_trace12_test.dart b/tests/lib/async/stack_trace12_test.dart
index 1d1e8af3fedcf99d36bed6111f77a05552c03465..c067d8fa662de2b1d4680002cfff05e2811e4edf 100644
--- a/tests/lib/async/stack_trace12_test.dart
+++ b/tests/lib/async/stack_trace12_test.dart
@@ -9,11 +9,14 @@ import 'dart:async';
 main() {
   StackTrace trace;
   asyncStart();
-  var f = new Future(() { throw "foo"; });
-  f.then((_) { throw "Unreachable"; },
-    onError: (e, st) {
-      Expect.equals("foo", e);
-      Expect.isNotNull(st);
-      asyncEnd();
-    });
+  var f = new Future(() {
+    throw "foo";
+  });
+  f.then((_) {
+    throw "Unreachable";
+  }, onError: (e, st) {
+    Expect.equals("foo", e);
+    Expect.isNotNull(st);
+    asyncEnd();
+  });
 }