Format all tests.

tests/language_strong/mixin_abstract_getter_test.dart

Index: tests/language_strong/mixin_abstract_getter_test.dart
diff --git a/tests/language_strong/mixin_abstract_getter_test.dart b/tests/language_strong/mixin_abstract_getter_test.dart
index 98ee18c6bcff70a76959d500a59c22d9db6b1b03..7fe7bd92363ddfa6ceb3929ff64895055195135c 100644
--- a/tests/language_strong/mixin_abstract_getter_test.dart
+++ b/tests/language_strong/mixin_abstract_getter_test.dart
@@ -18,7 +18,6 @@ class D extends C with B {
   D(this.x);
 }
 
-
 class C2 {
   int get x => 42;
 }
@@ -33,7 +32,6 @@ class D2 extends B2 {
   D2(this.x);
 }
 
-
 void main() {
   var d = new D(17);
   Expect.equals(d.x, 17);