In September 2015 (Chrome 45) we will remove the override and NPAPI support will be permanently removed from Chrome. Installed extensions that require NPAPI plugins will no longer be able to load those plugins.
Google Chrome users who rely on functionality that NPAPI plugins provide won't be able to make use of it anymore with the release of Chrome 45. NPAPI-only plugins such as Java or Silverlight are used throughout the web and while their use is declining, there are numerous applications and services that make use of either one or another plugin.
Announcement on Google Product Forums: https://productforums.google.com/forum/#!topic/chrome/TYbj21PkcAQ
It's the end of an era. I expect Mozilla Firefox to jump in soon, and Internet Explorer to eventually follow (if Microsoft even cares, but they removed these in Microsoft Edge). This being said, this will force the developpers to explore new technologies that are more secure, and the removal of NPAPI plugins support in Google Chrome makes it even more secure than before.