- Electron version: 1.2.6
- Operating system: osx yosemite

Do the autoUpdater objects on osx and windows have different properties? On windows, when i do `console.log(JSON.stringify(autoUpdater));`
I see the properties `domain`, `_events`, `_eventsCount`, and `updateURL`. However, doing the same thing on osx only allows me to see the properties `_events` and `_eventsCount`. 

I want to access `updateURL` in my code but I'm wondering whether that property is accessible. Maybe I should submit a PR for a `getFeedURL` method?

atom/browser/api/atom_api_auto_updater.cc
auto_updater::AutoUpdater::SetDelegate(this);
  Init(isolate);
}
AutoUpdater::~AutoUpdater() {
  auto_updater::AutoUpdater::SetDelegate(nullptr);
}
void AutoUpdater::OnError(const std::string& message) {
  v8::Locker locker(isolate());
  v8::HandleScope handle_scope(isolate());
  auto error = v8::Exception::Error(mate::StringToV8(isolate(), message));
  EmitCustomEvent(
      "error",
      error->ToObject(isolate()->GetCurrentContext()).ToLocalChecked(),
      
      message);
}
void AutoUpdater::OnCheckingForUpdate() {
  Emit("checking-for-update");
}
void AutoUpdater::OnUpdateAvailable() {
  Emit("update-available");
}
void AutoUpdater::OnUpdateNotAvailable() {
  Emit("update-not-available");
}
void AutoUpdater::OnUpdateDownloaded(const std::string& release_notes,