I often have to take screenshots of my WordPress themes and other products, and the look better when they have a browser frame around it. For this I open chrome without address bar and use the Mac OSX shortcuts CMD+Shit+4 + Spacebar to take the window screenshot with nice shadow.
Here are the commands to open chrome from terminal.
Chrome.exe --app=https://swiftthemes.com --incognito
/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --app=https://swiftthemes.com --incognito
google-chrome --app=https://swiftthemes.com --incognito
This removes all toolbars, not just the address bar, and gives me more screen real estate without having to use Kiosk mode.