src: add back gyp in DEPS
src: add back gyp in DEPS

https://github.com/nwjs/chromium.src/commit/47ea3123032c6dd6228582464f3187760ec78a10

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