Why doesn't Chromium have “Chrome PDF Viewer” plugin?

This is a nice way to get the PDF viewer to work in Chromium.  Essentially, you take the "command" from Chrome and link it, or copy it, to Chromium.

sudo ln -s /opt/google/chrome/libpdf.so /usr/lib/chromium-browser/

http://askubuntu.com/questions/12584/why-doesnt-chromium-have-chrome-pdf-viewer-plugin

http://askubuntu.com/questions/220913/pdf-viewer-in-chromium