It's going to be removed from Chromium, see https://crbug.com/812523.

/cc @electron/code-owners 
shell/browser/api/electron_api_app.h
v8::Global<v8::Value> dock_;
#endif
#if defined(MAS_BUILD)
  base::RepeatingCallback<void()> StartAccessingSecurityScopedResource(
      gin_helper::Arguments* args);
#endif
#if defined(OS_WIN)
  
  v8::Local<v8::Value> GetJumpListSettings();
  
  JumpListResult SetJumpList(v8::Local<v8::Value> val,
                             gin_helper::Arguments* args);
#endif  
  std::unique_ptr<ProcessSingleton> process_singleton_;
#if defined(USE_NSS_CERTS)
  std::unique_ptr<CertificateManagerModel> certificate_manager_model_;
#endif
  
  base::CancelableTaskTracker cancelable_task_tracker_;
  base::FilePath app_path_;
  using ProcessMetricMap =
      std::unordered_map<base::ProcessId,
                         std::unique_ptr<electron::ProcessMetric>>;
  ProcessMetricMap app_metrics_;
  DISALLOW_COPY_AND_ASSIGN(App);
};
}  
}  
#endif