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### Issue Details
This is a bug report specifically for the 7.0 beta. 

* **Electron Version:**
  * 7.0.0-beta.6
* **Operating System:**
  * Ubuntu 18.04 x64, Windows 10
* **Last Known Working Electron version:**
  * 6.0.12

### Expected Behavior
SharedWorker should be functional and *shared* when using
  a custom protocol to provide a proper origin.

### Actual Behavior
SharedWorker does not execute when loaded from custom protocol.
It does execute when page is loaded with the `file://` protocol, but this 
  defeats the purpose, since it is not shared between contexts.

Also noticed while diagnosing the issue:
Creating a SharedWorker with node integration enabled using a Data URL crashes 
the renderer.  I verified that this works in Electron 6, figured the cause might be related.

### To Reproduce
Install and run the following repo:

https://github.com/krisdages/electron-7-shared-worker-broken

$ git clone https://github.com/krisdages/electron-7-shared-worker-broken
$ npm install
$ npm start

Sorry, had it implemented before seeing the "electron fiddle" option. May try that next time.

Thanks for looking into this :)
shell/browser/electron_browser_client.cc
content::RenderFrameHost* render_frame_host,
    mojo::BinderMapWithContext<content::RenderFrameHost*>* map) {
  map->Add<network_hints::mojom::NetworkHintsHandler>(
      base::BindRepeating(&BindNetworkHintsHandler));
#if BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS)
  map->Add<extensions::mime_handler::MimeHandlerService>(
      base::BindRepeating(&BindMimeHandlerService));
  map->Add<extensions::mime_handler::BeforeUnloadControl>(
      base::BindRepeating(&BindBeforeUnloadControl));
  content::WebContents* web_contents =
      content::WebContents::FromRenderFrameHost(render_frame_host);
  if (!web_contents)
    return;
  const GURL& site = render_frame_host->GetSiteInstance()->GetSiteURL();
  if (!site.SchemeIs(extensions::kExtensionScheme))
    return;
  content::BrowserContext* browser_context =
      render_frame_host->GetProcess()->GetBrowserContext();
  auto* extension = extensions::ExtensionRegistry::Get(browser_context)
                        ->enabled_extensions()
                        .GetByID(site.host());
  if (!extension)
    return;
  extensions::ExtensionsBrowserClient::Get()
      ->RegisterBrowserInterfaceBindersForFrame(map, render_frame_host,
                                                extension);
#endif
}
#if defined(OS_LINUX)
void ElectronBrowserClient::GetAdditionalMappedFilesForChildProcess(