It wasn't moved, the opening and closing sentences had don't be evil, they removed the preface paragraph at the top, but left they closing sentence.

“Preface Don’t be evil.” Googlers generally apply those words to how we serve our users. But “Don’t be evil” is much more than that. Yes, it’s about providing our users unbiased access to information, focusing on their needs and giving them the best products and services that we can. But it’s also about doing the right thing more generally – following the law, acting honorably, and treating co-workers with courtesy and respect. The Google Code of Conduct is one of the ways we put “Don’t be evil” into practice.”

Closing sentence:

And remember… don’t be evil, and if you see something that you think isn’t right – speak up!

The closing sentence that remains doesn't carry much weight without the preface.