Why does it matter it is "biased"? It was the only mainstream news agency that reported this in this detail. Other news outlets reported it too:
https://www.usatoday.com/story/tech/news/2016/06/10/google-s... http://www.dailymail.co.uk/news/article-3785801/Is-Google-ma... http://www.washingtonexaminer.com/google-denies-manipulating... https://www.redstate.com/streiff/2017/05/30/google-gave-hill...
I checked it myself during the time and Breitbart article is entirely correct.