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### Issue Details

* **Electron Version:**
  * 10.0.1
  * 10.0.0-beta.10
  * 9.2.1
* **Operating System:**
  * Windows 10 (2004)
  * macOS 10.15.6
* **Last Known Working Electron version:**
  * 10.0.0-beta.9
  * Issue is seen in 10.0.0-beta.10

### Expected Behavior
AudioWorklets can be created and destroyed multiple times while `nodeIntegrationInWorker` is enabled.

### Actual Behavior
AudioWorklet can only be created and destroyed once. Upon creating a second AudioWorklet, the UI hangs indefinitely.

### To Reproduce
Electron Fiddle: https://gist.github.com/samuelmaddock/5430479c0a08eca3f693df2518c9887d

1. Load Audio Worklet examples directory: https://googlechromelabs.github.io/web-audio-samples/audio-worklet/
2. Open a demo and click start.
3. Navigate back and return to the demos directory.
4. Open another demo and click start.

UI should no longer be responsive.

shell/common/node_bindings.cc
env->InitializeDiagnostics();
  node::SetIsolateUpForNode(context->GetIsolate(), is);
  gin_helper::Dictionary process(context->GetIsolate(), env->process_object());
  process.SetReadOnly("type", process_type);
  process.Set("resourcesPath", resources_path);
  
  base::FilePath helper_exec_path;
  base::PathService::Get(content::CHILD_PROCESS_EXE, &helper_exec_path);
  process.Set("helperExecPath", helper_exec_path);
  return env;
}
void NodeBindings::LoadEnvironment(node::Environment* env) {
  node::LoadEnvironment(env);
  gin_helper::EmitEvent(env->isolate(), env->process_object(), "loaded");
}
void NodeBindings::PrepareMessageLoop() {
  
  
  uv_async_init(uv_loop_, &dummy_uv_handle_, nullptr);
  
  uv_sem_init(&embed_sem_, 0);
  uv_thread_create(&embed_thread_, EmbedThreadRunner, this);
}
void NodeBindings::RunMessageLoop() {
  
  task_runner_ = base::ThreadTaskRunnerHandle::Get();
  
  UvRunOnce();
}
void NodeBindings::UvRunOnce() {