Google Chrome has removed NPAPI support, not planning to add it. In the release of 64-bit Chrome, they also completely removed NPAPI. They have been gradually removing it since the beginning of 2014 by blocking most plugins except the most used ones, including Unity Web Player. Just recently they have completely removed it all. You will not be able to play Unity Web Player in Chrome until Unity releases Unity 5.
Read this: http://blog.chromium.org/2013/09/saying-goodbye-to-our-old-friend-npapi.html