- Electron version: v1.2.2
- Operating system: OS X El Capitan 10.11.5

When `<webview>.isAudioMuted() === true` [Notifications](https://developer.mozilla.org/de/docs/Web/API/notification) from the Webview still make sounds.

atom/browser/atom_browser_client.cc
content::BrowserContext* browser_context,
    content::SiteInstance* current_instance,
    const GURL& url,
    content::SiteInstance** new_instance) {
  if (g_suppress_renderer_process_restart) {
    g_suppress_renderer_process_restart = false;
    return;
  }
  
  if (url.SchemeIs(url::kJavaScriptScheme))
    return;
  scoped_refptr<content::SiteInstance> site_instance =
      content::SiteInstance::CreateForURL(browser_context, url);
  *new_instance = site_instance.get();
  
  
  
  content::BrowserThread::PostTask(
      content::BrowserThread::UI, FROM_HERE,
      base::Bind(&Noop, base::RetainedRef(site_instance)));
  
  auto current_process = current_instance->GetProcess();
  auto pending_process = (*new_instance)->GetProcess();
  pending_processes_[pending_process->GetID()] = current_process->GetID();
  
  current_process->AddObserver(this);
}
void AtomBrowserClient::AppendExtraCommandLineSwitches(