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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/renderer/electron_renderer_client.cc
}
  
  if (!node::tracing::TraceEventHelper::GetAgent())
    node::tracing::TraceEventHelper::SetAgent(node::CreateAgent());
  
  bool initialized = node::InitializeContext(renderer_context);
  CHECK(initialized);
  node::Environment* env =
      node_bindings_->CreateEnvironment(renderer_context, nullptr);
  
  
  if (command_line->HasSwitch(switches::kDisableElectronSiteInstanceOverrides))
    env->ForceOnlyContextAwareNativeModules();
  env->WarnNonContextAwareNativeModules();
  environments_.insert(env);
  
  electron_bindings_->BindTo(env->isolate(), env->process_object());
  AddRenderBindings(env->isolate(), env->process_object());
  gin_helper::Dictionary process_dict(env->isolate(), env->process_object());
  process_dict.SetReadOnly("isMainFrame", render_frame->IsMainFrame());
  
  node_bindings_->LoadEnvironment(env);
  if (node_bindings_->uv_env() == nullptr) {
    
    node_bindings_->set_uv_env(env);
    
    node_bindings_->RunMessageLoop();
  }
}
void ElectronRendererClient::WillReleaseScriptContext(