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### Issue Details

* **Electron Version:**
  * v9.0.0
* **Operating System:**
  * Windows 10
* **Last Known Working Electron version:**
  * v8.3.0

### Expected Behavior
My app shows a gallery of images from local disk. Electron 8.2.0 would show images. v9.0.0 shows blanks with error:
```
GET file:///C:/VHA/vha-videos/filmstrips/6f3acc0aeee45a7af5404e3849d8719f.jpg 
net::ERR_UNKNOWN_URL_SCHEME
```

### Actual Behavior
App does not show local images

### To Reproduce
Clone https://github.com/whyboris/Video-Hub-App
Run the app, create a "hub" (give it a folder with videos) and it will create a gallery of images.
Exit the app, update to Electron 9 (comment out 2 lines of `shell.openItem`) and run app again

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### Screenshots

![image](https://user-images.githubusercontent.com/17264277/82849048-31880d80-9ec4-11ea-95fc-6639cf36e858.png)


### Additional Information
<!-- Add any other context about the problem here. -->

shell/browser/electron_browser_client.cc
base::StringPiece scheme,
    bool is_embedded_origin_secure) {
  if (is_embedded_origin_secure && scheme == content::kChromeUIScheme)
    return true;
#if BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS)
  return scheme == extensions::kExtensionScheme;
#else
  return false;
#endif
}
bool ElectronBrowserClient::WillInterceptWebSocket(