Disable formatting and add new-lines to make tests faster.

test/dart_codegen/expect/core/null.dart

 part of dart.core;
-
-class Null {
-  factory Null._uninstantiable() {
-    throw new UnsupportedError('class Null cannot be instantiated');
+ class Null {factory Null._uninstantiable() {
+  throw new UnsupportedError('class Null cannot be instantiated');
   }
-  String toString() => "null";
+ String toString() => "null";
 }