UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.95 Safari/537.36

Steps to reproduce the problem:
1. Visit https://hackerbay-iiieb-development.onesignal.com
2. Run this code in the DevTools Console:

if (Notification.permission !== "granted") {
    alert("Please grant notification permissions when prompted.");
    Notification.requestPermission(function(permission) {
      if (permission === "granted") {
        doStuff();
      } else {
        alert("Please make sure you're not using Incognito mode or that your profile is not set to block notification permissions.")
      }
    });
} else {
    doStuff();
}

function doStuff() {
  new Notification("Title", {
  	body: "Some content here."
  });
}

3.  Observe the notification URL looks like something: http://i.imgur.com/kn1x4xE.png.

Note: This also works with the URL https://hackerbay-web-development.onesignal.com, maybe because one 'w' character is roughly equal to the spacing of three 'i' characters.

What is the expected behavior?
Notification URL should look like: http://i.imgur.com/JyYrpQ4.png for long origins.

What went wrong?
Notification URL of a specific length is wrapped on both sides ...fragment... and padded with spaces on the right.

Did this work before? N/A 

Chrome version: 55.0.2883.95  Channel: stable
OS Version: OS X 10.11.6
Flash Version: Shockwave Flash 24.0 r0

You can create any random subdomain on OneSignal by visiting anything-you-want.onesignal.com and run the same code. Here is an album of some tests: http://imgur.com/a/BUL2L.