Closing InAppBrowser when "Done" button is clicked

In my ionic+cordova app, I have a link to a local mp3 file that I would like to play within the InAppBrowser. When I click on it, everything is ok and it starts playing:

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However, once I hit that "Done" button on the top left, I get this screen:

enter image description here

How can I get the window to close when I hit the "Done" button? Here is the code I am using:

window.open('audio/sample.mp3', 'location=no');

Check this:

var yourWindow = window.open('audio/sample.mp3', 'location=no');

when it dones:

yourWindow.close();