These events are emitted for every navigation request which isn't really efficient. Also upstream has removed the observers that provide these details as part of network servification https://chromium-review.googlesource.com/c/chromium/src/+/805008 and https://chromium-review.googlesource.com/c/chromium/src/+/786320. We are removing it as a part of chromium 66 upgrade.

Proposed alternative: Users can use the [webRequest](https://github.com/electron/electron/blob/master/docs/api/web-request.md) module which provides similar navigation details on a subscription basis.
atom/browser/api/atom_api_web_contents.cc
void OnSetTemporaryZoomLevel(double level, IPC::Message* reply_msg) {
    api_web_contents->OnSetTemporaryZoomLevel(rfh, level, reply_msg);
  }
  void OnGetZoomLevel(IPC::Message* reply_msg) {
    api_web_contents->OnGetZoomLevel(rfh, reply_msg);
  }
  void OnRendererMessageSync(const base::string16& channel,
                             const base::ListValue& args,
                             IPC::Message* message) {
    api_web_contents->OnRendererMessageSync(rfh, channel, args, message);
  }
};
WebContents::WebContents(v8::Isolate* isolate,
                         content::WebContents* web_contents,
                         Type type)
    : content::WebContentsObserver(web_contents),
      embedder_(nullptr),
      zoom_controller_(nullptr),
      type_(type),
      request_id_(0),
      background_throttling_(true),
      enable_devtools_(true) {
  const mate::Dictionary options = mate::Dictionary::CreateEmpty(isolate);
  if (type == REMOTE) {