- 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
const std::vector<std::string>& schemes) {
  g_custom_service_worker_schemes = base::JoinString(schemes, ",");
}
AtomBrowserClient::AtomBrowserClient() : delegate_(nullptr) {
}
AtomBrowserClient::~AtomBrowserClient() {
}
content::WebContents* AtomBrowserClient::GetWebContentsFromProcessID(
    int process_id) {
  
  if (ContainsKey(pending_processes_, process_id))
    process_id = pending_processes_[process_id];
  
  
  return WebContentsPreferences::GetWebContentsFromProcessID(process_id);
}
void AtomBrowserClient::RenderProcessWillLaunch(
    content::RenderProcessHost* host) {
  int process_id = host->GetID();
  host->AddFilter(new printing::PrintingMessageFilter(process_id));
  host->AddFilter(new TtsMessageFilter(process_id, host->GetBrowserContext()));
  host->AddFilter(
      new WidevineCdmMessageFilter(process_id, host->GetBrowserContext()));
}
content::SpeechRecognitionManagerDelegate*
    AtomBrowserClient::CreateSpeechRecognitionManagerDelegate() {
  return new AtomSpeechRecognitionManagerDelegate;
}
content::AccessTokenStore* AtomBrowserClient::CreateAccessTokenStore() {