See 
https://bugs.chromium.org/p/chromium/issues/detail?id=834804 - as tracked in that bug we implemented error reporting for JSON policies with unparsable JSON, or JSON that didn't match the schema. However, we still don't reject policies that we consider invalid - not until we are sure that the validator is working properly and we won't break anything.

This bug is to track that change - once we are sure the validators are working properly, and that nobody is relying on the ability to store invalid JSON policies in the pref store, we should reject invalid policies. This can be done simply by setting allow_errors_in_embedded_json_ to false.