src: newwin: transparency for windows
src: newwin: transparency for windows

https://github.com/nwjs/chromium.src/commit/3571cf58430692dbeab3c44a1e4a02de7a1890f0

nwjs/nw.js,nwjs/nw.js,nwjs/nw.js,nwjs/nw.js,nwjs/nw.js,nwjs/nw.js