* **Electron Version** (output of `node_modules/.bin/electron --version`):
  * 3.0.6
* **Operating System** (Platform and Version):
  * macOS 10.14

### Expected Behavior
a `new-window` event fires

### Actual behavior
a `did-fail-load` fires with errorCode -3

### To Reproduce
```sh
$ git clone git@github.com:chrismohr/no-new-window.git -b master
$ cd no-new-window/
$ npm i && npm start
```

atom/browser/atom_browser_client.cc
if (BrowserThread::CurrentlyOn(BrowserThread::IO))
    return g_io_thread_application_locale.Get();
  return *g_application_locale;
}
bool AtomBrowserClient::ShouldEnableStrictSiteIsolation() {
  
  return true;
}
}