Interesting post, seen on https://chrome.google.com/webstore/detail/cdngiadmnkhgemkimkhiilgffbjijcie:
You don't need any 3rd pary extension to block flash anymore. To enable Chrome's built in Flashblock type 'about:flags' into the address bar and hit enter. Scroll down to the botton and enable 'Click to play', then restart your browser. Now click the wrench menu > Options > Under the hood > Content setting > Plug-ins and select 'Click to play' from the right hand side. You can use the Exception button to whitelist specific domains.
