Format all tests.

tests/corelib_strong/list_to_string_test.dart

Index: tests/corelib_strong/list_to_string_test.dart
diff --git a/tests/corelib_strong/list_to_string_test.dart b/tests/corelib_strong/list_to_string_test.dart
index a127c268632fff7c6fb9d5029661e8c4b185e711..fed5277fe18e1fab33b265ee9653980b747feec7 100644
--- a/tests/corelib_strong/list_to_string_test.dart
+++ b/tests/corelib_strong/list_to_string_test.dart
@@ -10,7 +10,9 @@ class MyList extends ListBase {
   MyList(this.list);
 
   get length => list.length;
-  set length(val) { list.length = val; }
+  set length(val) {
+    list.length = val;
+  }
 
   operator [](index) => list[index];
   operator []=(index, val) => list[index] = val;