Here are some informations about fiddle.jshell.net:
http://www.webutations.org/go/review/fiddle.jshell.net and http://support.clean-mx.com/clean-mx/phishing.php?domain=jshell.net&sort=id%20DESC
Also, here Google explains Google Chrome 17+ Speed and Security policies: http://chrome.blogspot.ro/2012/01/speed-and-security.html
However, people can submit pishing websites that will be analized and tested.
Google's Diagnostic Webpage: http://www.google.com/safebrowsing/diagnostic?site=fiddle.jshell.net
My suggestion is to upgrade your browser version even though Google says that it is Secured.