* 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
#ifndef ATOM_BROWSER_NATIVE_WINDOW_MAC_H_
#define ATOM_BROWSER_NATIVE_WINDOW_MAC_H_
#import <Cocoa/Cocoa.h>
#include <string>
#include <vector>
#include "atom/browser/native_window.h"
#include "base/mac/scoped_nsobject.h"
#include "content/public/browser/render_widget_host.h"
@class AtomNSWindow;
@class AtomNSWindowDelegate;
@class FullSizeContentView;