You will need to install a user script manager extension to install this script.
I've created a new Chrome Extension that is easier to use: https://chrome.google.com/webstore/detail/chocolate-factory/haaendbfglnbfcbmfgfkhjplbakbbpbj
NOTE: This script was written by SundaraRaman R (https://groups.google.com/forum/#!msg/chocolatey/yR5eLstXRoU/marZ-vdi9HcJ). I've fixed it to work with the latest version of chocolatey.org.
Here's the description from the original author [edited]:
I discovered Chocolatey very recently and have immediately fallen in love with the idea. I've been turning most software on my computer into Chocolatey-managed ones, but wished to avoid copying and pasting the 'choco install' commands for each package. So, I wrote a userscript which allows you to prepare a single command to install multiple packages.
The single command (which I call a "box of chocolates") is immediately synchronized across tabs, reloads, back, forward, etc. (using 'localStorage' and storage events).