- Electron version: 1.2.1
- Operating system: Mac OS X

See also https://github.com/electron/electron/issues/5714

STR:
1. Start a webserver on localhost:port that serves a dummy index.html
2. Register a custom http protocol.
   
   ``` js
   electron.protocol.registerStandardSchemes(['foobar', 'http', 'https']);
   
   app.on('ready', function() {
     electron.protocol.registerHttpProtocol('foobar', (request, callback) => {
       const redirectPath = `http://localhost:port/index.html`;
       callback({ method: request.method, referrer: request.referrer, url: redirectPath });
     }, e => { if (e) { console.log(e); } });
   });
   ```
3. Either through devtools, or via some js in our index.html, have a single line that does `fetch('http://localhost:port/index.html')` or anything else from our server.

Results: as soon as `fetch` is called, the webview becomes black, and the devtools crash if they were open. No other visible error or stdout.

If devtools were open, they show this message: "Devtools was disconnected from the page.
Once page is reloaded, DevTools will automatically reconnect."

atom/renderer/atom_renderer_client.cc
content::RenderFrame* render_frame) {
  new PepperHelper(render_frame);
  new AtomRenderFrameObserver(render_frame, this);
  
  
  blink::WebSecurityPolicy::registerURLSchemeAsAllowingServiceWorkers("file");
}
void AtomRendererClient::RenderViewCreated(content::RenderView* render_view) {
  new printing::PrintWebViewHelper(render_view);
  new AtomRenderViewObserver(render_view, this);
  blink::WebFrameWidget* web_frame_widget = render_view->GetWebFrameWidget();
  if (!web_frame_widget)
    return;
  base::CommandLine* cmd = base::CommandLine::ForCurrentProcess();
  if (cmd->HasSwitch(switches::kGuestInstanceID)) {  
    web_frame_widget->setBaseBackgroundColor(SK_ColorTRANSPARENT);
  } else {  
    
    std::string name = cmd->GetSwitchValueASCII(switches::kBackgroundColor);
    
    SkColor color = name.empty() ? SK_ColorWHITE : ParseHexColor(name);
    web_frame_widget->setBaseBackgroundColor(color);
  }
}
void AtomRendererClient::DidClearWindowObject(