Format all tests.

tests/lib/async/stack_trace17_test.dart

Index: tests/lib/async/stack_trace17_test.dart
diff --git a/tests/lib/async/stack_trace17_test.dart b/tests/lib/async/stack_trace17_test.dart
index b658a665b8545409061c65b032aff042111924a9..b7f33c544e9f3d4bcc0e9bb79275c6d11b7986b3 100644
--- a/tests/lib/async/stack_trace17_test.dart
+++ b/tests/lib/async/stack_trace17_test.dart
@@ -18,14 +18,14 @@ main() {
   Completer completer = new Completer();
   StackTrace trace = captureStackTrace();
   asyncStart();
-  completer.future
-    .whenComplete(() => 499)
-    .then((_) { throw "bad things happen"; })
-    .then((_) { throw "Unreachable"; },
-      onError: (e, st) {
-        Expect.equals("bad things happen", e);
-        Expect.isNotNull(st);
-        asyncEnd();
-      });
+  completer.future.whenComplete(() => 499).then((_) {
+    throw "bad things happen";
+  }).then((_) {
+    throw "Unreachable";
+  }, onError: (e, st) {
+    Expect.equals("bad things happen", e);
+    Expect.isNotNull(st);
+    asyncEnd();
+  });
   completer.complete(499);
 }