* Electron version:1.4.14
* Operating system: mac v10.12.3

### Expected behavior

setting  BrowserWindow options frame false

browser Top frame zone 

There is an invisible window

<!-- What do you think should happen? -->

i want work css cursor:pointer

my option code

	mainWindow = new BrowserWindow({
            show: false,
            frame: false,// look
            title: "",
            useContentSize: false,
            width: mainWindowWidth,
            minWidth: mainWindowWidth,
            height: mainWindowHeight,
            minHeight: mainWindowHeight,
            maximizable:false,
            fullscreenable:false,
            icon: iconPath
        });


atom/browser/native_window_mac.h
namespace atom {
class NativeWindowMac : public NativeWindow,
                        public content::RenderWidgetHost::InputEventObserver {
 public:
  NativeWindowMac(brightray::InspectableWebContents* inspectable_web_contents,
                  const mate::Dictionary& options,
                  NativeWindow* parent);
  ~NativeWindowMac() override;
  
  void Close() override;
  void CloseImmediately() override;
  void Focus(bool focus) override;
  bool IsFocused() override;
  void Show() override;
  void ShowInactive() override;
  void Hide() override;
  bool IsVisible() override;
  bool IsEnabled() override;
  void Maximize() override;
  void Unmaximize() override;
  bool IsMaximized() override;
  void Minimize() override;
  void Restore() override;
  bool IsMinimized() override;
  void SetFullScreen(bool fullscreen) override;
  bool IsFullscreen() const override;
  void SetBounds(const gfx::Rect& bounds, bool animate = false) override;
  gfx::Rect GetBounds() override;
  void SetContentSizeConstraints(
      const extensions::SizeConstraints& size_constraints) override;