It is an official Google extension. I doubt they would try to steel any private keys.
In the same press release they said they fixed the problem and would be deleting the logs, but many governments quickly stopped them from deleting the logs so they could investigate.
That's probably why they announced they would delete them before they actually did. And the investigations found that Google was not at fault for accidentally recording unencrypted publicly transmitted data. ;)
http://git.chromium.org/gitweb/?p=chromiumos/platform/assets...