Format all tests.

tests/lib/async/stack_trace15_test.dart

Index: tests/lib/async/stack_trace15_test.dart
diff --git a/tests/lib/async/stack_trace15_test.dart b/tests/lib/async/stack_trace15_test.dart
index 4f580768e8a0ec7f2f434ce3496b8e3a979e1d59..e52b4eb4a8fed7a873ec3cd48d8e82919ceb2190 100644
--- a/tests/lib/async/stack_trace15_test.dart
+++ b/tests/lib/async/stack_trace15_test.dart
@@ -18,13 +18,13 @@ main() {
   StackTrace trace = captureStackTrace();
   asyncStart();
   var f = new Future(() => 499);
-  f.then((_) => new Future.error("e", trace))
-    .whenComplete(() => 499)
-    .then((_) { throw "should never be reached"; })
-    .then((_) { throw "Unreachable"; },
-      onError: (e, st) {
-        Expect.equals("e", e);
-        Expect.identical(trace, st);
-        asyncEnd();
-      });
+  f.then((_) => new Future.error("e", trace)).whenComplete(() => 499).then((_) {
+    throw "should never be reached";
+  }).then((_) {
+    throw "Unreachable";
+  }, onError: (e, st) {
+    Expect.equals("e", e);
+    Expect.identical(trace, st);
+    asyncEnd();
+  });
 }