Delete a single site's cookies in Chrome 59+?

Update 2:

If the cookies are for the site you're currently browsing, the easiest way to delete them is to open Developer Tools, go to the Application tab, and under Storage you'll find Cookies, with a cookie hierarchy for this site. You can add + delete individual cookies on this page, as well as right click the site in the left pane and select Clear to delete all of a site's cookies.

Update:

As of Chrome ~ v61.0.3163.100, the flag mentioned below is no longer available, but enhanced cookie control is available in the Material Design Settings.

chrome://settings/content/cookies?search=cookie

Old Answer

Chrome has an experimental feature which disables the new Material Design Settings page and reverts to the old Settings page style. From there, you can access the cookies the old way: Settings > Show advanced settings… > Content Settings... > All cookies and site data...

You can find the setting by entering this in your address bar:

chrome://flags/#enable-md-settings

If you're not familiar with Chrome's Experimental Features, read the warning at the top of the page before changing anything.