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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
RendererSpawnFlags flags) {
  
  sandbox::ResultCode result = policy->AddRule(
      sandbox::TargetPolicy::SUBSYS_FILES,
      sandbox::TargetPolicy::FILES_ALLOW_ANY, L"\\??\\pipe\\crashpad_*");
  if (result != sandbox::SBOX_ALL_OK)
    return false;
  return true;
}
#endif  
bool ElectronBrowserClient::BindAssociatedReceiverFromFrame(
    content::RenderFrameHost* render_frame_host,
    const std::string& interface_name,
    mojo::ScopedInterfaceEndpointHandle* handle) {
  if (interface_name == mojom::ElectronAutofillDriver::Name_) {
    AutofillDriverFactory::BindAutofillDriver(
        mojom::ElectronAutofillDriverAssociatedRequest(std::move(*handle)),
        render_frame_host);
    return true;
  }
  return false;
}
std::string ElectronBrowserClient::GetApplicationLocale() {