Format all tests.

tests/language_strong/label5_negative_test.dart

Index: tests/language_strong/label5_negative_test.dart
diff --git a/tests/language_strong/label5_negative_test.dart b/tests/language_strong/label5_negative_test.dart
index d1a9e0c7c577b3bac9ca2c12138a6ed15f7ad5f3..520fbb442220c60721095a03d4b2272f20665250 100644
--- a/tests/language_strong/label5_negative_test.dart
+++ b/tests/language_strong/label5_negative_test.dart
@@ -3,7 +3,6 @@
 // BSD-style license that can be found in the LICENSE file.
 // Dart test program to test check that we catch label errors.
 
-
 class Label5NegativeTest {
   static testMain() {
     var L = 33;
@@ -13,7 +12,6 @@ class Label5NegativeTest {
   }
 }
 
-
 main() {
   Label5NegativeTest.testMain();
 }