Format all tests.

tests/language/generic_field_mixin4_test.dart

Index: tests/language/generic_field_mixin4_test.dart
diff --git a/tests/language/generic_field_mixin4_test.dart b/tests/language/generic_field_mixin4_test.dart
index b1490fd4a0ad7601868d0a457ecc47c444f20a07..994db59f4953d62dc9570acc1bdaf550c77e552a 100644
--- a/tests/language/generic_field_mixin4_test.dart
+++ b/tests/language/generic_field_mixin4_test.dart
@@ -12,12 +12,13 @@ class M<T> {
       throw 0;
     } on T catch (e) {
       return true;
-    } catch (e) {
-    }
+    } catch (e) {}
     return false;
   }();
 }
+
 class A<U> {}
+
 class C1<V> = Object with M<V>;
 class C2 = Object with M<int>;
 class C3 = Object with M<String>;
@@ -29,4 +30,4 @@ main() {
   Expect.isTrue(new C2().field);
 
   Expect.isFalse(new C3().field);
-}
+}