Format all tests.

tests/lib_strong/async/stack_trace16_test.dart

Index: tests/lib_strong/async/stack_trace16_test.dart
diff --git a/tests/lib_strong/async/stack_trace16_test.dart b/tests/lib_strong/async/stack_trace16_test.dart
index 3a8470a338f04cd25cfda037a4cf26fcf349364b..a54a56e9f9d3186246bb7a6bcf4a0f74867af4c5 100644
--- a/tests/lib_strong/async/stack_trace16_test.dart
+++ b/tests/lib_strong/async/stack_trace16_test.dart
@@ -18,14 +18,14 @@ main() {
   Completer completer = new Completer();
   StackTrace trace = captureStackTrace();
   asyncStart();
-  completer.future
-    .whenComplete(() => 499)
-    .then((_) { throw "should never be reached"; })
-    .then((_) { throw "Unreachable"; },
-      onError: (e, st) {
-        Expect.equals("c-error", e);
-        Expect.identical(trace, st);
-        asyncEnd();
-      });
+  completer.future.whenComplete(() => 499).then((_) {
+    throw "should never be reached";
+  }).then((_) {
+    throw "Unreachable";
+  }, onError: (e, st) {
+    Expect.equals("c-error", e);
+    Expect.identical(trace, st);
+    asyncEnd();
+  });
   completer.completeError("c-error", trace);
 }