Well....it's fixed for me. I play battlefield 4, and it's latest plugin (http://battlelog.battlefield.com/) automatically enables the part that is now broken when you update it. To manually do this, I believe you do this:
1. Type "chrome://flags" (without quotes) into the address bar.
2. Scroll down and click "Enable" under "Enable NPAPI".
3. Close Chrome.
Note that you may have to reboot as chrome still has plugins running even after you close down the browsers tabs. I had to go into task manager and end task on each Chrome Process still running for the battlefield auto fix to do it's job as it kept telling me to please close chrome for fix. After doing this, the loop was broken and my slingplayer plugin works again.