Format all tests.

tests/language_strong/covariant_override/runtime_check_test.dart

Index: tests/language_strong/covariant_override/runtime_check_test.dart
diff --git a/tests/language_strong/covariant_override/runtime_check_test.dart b/tests/language_strong/covariant_override/runtime_check_test.dart
index a47118fe9d3a000ce984b7a8a0ef1a5cbcee4818..fc8a6cec741cb2e2089c66a0f00d4c677abb97dc 100644
--- a/tests/language_strong/covariant_override/runtime_check_test.dart
+++ b/tests/language_strong/covariant_override/runtime_check_test.dart
@@ -8,6 +8,7 @@ class View {
   addChild(View v) {}
   transform(View fn(View v)) {}
 }
+
 class MyView extends View {
   addChild(covariant MyView v) {}
   transform(covariant MyView fn(Object v)) {}
@@ -16,7 +17,7 @@ class MyView extends View {
 main() {
   dynamic mv = new MyView();
   dynamic v = new View();
-  
+
   mv.addChild(mv);
   Expect.throws(() => mv.addChild(v));