Make .def and .rc plugin files Windows-only.
Make .def and .rc plugin files Windows-only.

Review URL: http://codereview.chromium.org/1585006

git-svn-id: http://src.chromium.org/svn/trunk/src@43232 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 25095303eacfff60af546f55924ea09de084ef69
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser