This modifies the implementation to delete the registry keys via `DeleteSubKey` instead of `DeleteSubKeyTree`. This no longer throws when the DENY permission is set on a registry key as is the case for file association keys. This does throw when we are unable to delete a registry key as has been observed in newer versions of windows. Similar to the Win32 API implementation, this now halts execution and returns an error to the invoking process.
Differential Revision: https://phabricator.services.mozilla.com/D203069
2f55e17b91