UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36

Steps to reproduce the problem:
1. Serve this website over HTTPS:

index.html:
```
<img src="http://i.imgur.com/ztApnbv.jpg">
<script>
navigator.serviceWorker.register('sw.js');
</script>
```

sw.js
```
self.addEventListener('fetch', ev => ev.respondWith(fetch(ev.request)));
```
2. Go to hosted site, see the linked image being loaded
3. Refresh, see the linked image being blocked

I have hosted this example here: https://f.surma.link/sw-passthrough/

What is the expected behavior?
The image should still load, as stated by the SW spec:

https://w3c.github.io/webappsec-mixed-content/#is-passthrough

What went wrong?
Mixed content is blocked when it is loaded through a service worker, even if it is passive content.

Did this work before? No 

Chrome version: 50.0.2661.102  Channel: stable
OS Version: OS X 10.11.4
Flash Version: Shockwave Flash 21.0 r0
 

Deleted: index.html 105 bytes

index.html 105 bytes View Download

Deleted: sw.js 73 bytes

sw.js 73 bytes View Download