Remove unused field save_rollback_data

save_rollback_data is inherited from ChromeOS to persist data
after a data wipe. Android never supported this feature, remove
unused code.

Test: th
Bug: 377557752
Change-Id: I022577bb19cd27010ffe0236b2659fe7880f03c4
diff --git a/common/test_utils.h b/common/test_utils.h
index b85f80d..2a582b1 100644
--- a/common/test_utils.h
+++ b/common/test_utils.h
@@ -175,7 +175,7 @@
 // This is a simple Action class for testing. It feeds an object into
 // another action.
 template <typename T>
-class ObjectFeederAction : public Action<ObjectFeederAction<T>> {
+class ObjectFeederAction final : public Action<ObjectFeederAction<T>> {
  public:
   typedef NoneType InputObjectType;
   typedef T OutputObjectType;