Call super constructor (closure compiler and library)

Using the Google closure compiler and library for inheritance I found two different calls of super constructor in a lot of closure based libraries (forgot where I found it). Not sure if I got it wrong at all.

What is the difference and what is the correct one to use?

// Xhrio extends EventTarget
goog.events.EventTarget.call(this);
goog.net.XhrIo.base(this, 'constructor');