Google’s left hand caught its right hand being naughty & slapped itself on the wrist last month.
Google demoted the PageRank — the rating Google assigns based on how many other sites link to a URL — for Chrome’s download site after it admitted a marketing campaign had violated the company’s own rules against paid links.
Seems its penalised itself for at least 60 days.
http://searchengineland.com/google-chrome-page-will-have-pagerank-reduced-due-to-sponsored-posts-106551