Fix console warning in LegacyImmutableObject

It does check `hasOwnProperty`, but *after* accessing the field and therefore triggering enumerable getters in modified prototypes.

Author: miorel

src/utils/LegacyImmutableObject.js

@@ -81,9 +81,11 @@ if (__DEV__) {
  }
  Object.freeze(object); // First freeze the object.
  for (var prop in object) {
- var field = object[prop];
- if (object.hasOwnProperty(prop) && shouldRecurseFreeze(field)) {
- deepFreeze(field);
+ if (object.hasOwnProperty(prop)) {
+ var field = object[prop];
+ if (shouldRecurseFreeze(field)) {
+ deepFreeze(field);
+ }
  }
  }
  };