Nicolas told me few minutes ago that it was impossible to reach any website from Google search results pages, all were marked as malware. Techcrunch has already reported this, apparently the problem was worldwide. Huge mistake from Google! A failed update? Quickly solved, but Google impacts on the internet are tremendous. Fortunately, everything is quite normal now.
Waiting for official update from Google on this problem.
UPDATE: Here is the official explanation from Marissa Mayer.