* **Electron Version:**
  4.0.2
* **Operating System:**
  macOS 10.14.3
* **Last Known Working Electron version:**:
  1.7

### Expected Behavior
When creating a BrowserWindow it should not appear in the dock menu by defaults.

### Actual Behavior
It appears in the dock menu (example: `raven` in https://electronjs.org/docs/tutorial/macos-dock)

### To Reproduce
Just create new BrowserWindow, then right click on the app icon in the dock. (see https://electronjs.org/docs/tutorial/macos-dock)

At least it should be a way to control that, this can be achieve for top level window with:
`[window_ setExcludedFromWindowsMenu:YES];`, indeed [window isExcludedFromWindowsMenu] returns false by default, see

https://developer.apple.com/documentation/appkit/nsapplication/1428625-removewindowsitem
`Use the isExcludedFromWindowsMenu method of NSWindow if you want the item to remain excluded from the Window menu.`
https://developer.apple.com/documentation/appkit/nswindow/1419175-isexcludedfromwindowsmenu

atom/browser/native_window.h
content::WebContents*,
      const content::NativeWebKeyboardEvent& event) {}
  
  
  void NotifyWindowRequestPreferredWith(int* width);
  void NotifyWindowCloseButtonClicked();
  void NotifyWindowClosed();
  void NotifyWindowEndSession();
  void NotifyWindowBlur();
  void NotifyWindowFocus();
  void NotifyWindowShow();
  void NotifyWindowHide();
  void NotifyWindowMaximize();
  void NotifyWindowUnmaximize();
  void NotifyWindowMinimize();
  void NotifyWindowRestore();
  void NotifyWindowMove();
  void NotifyWindowWillResize(const gfx::Rect& new_bounds,
                              bool* prevent_default);
  void NotifyWindowResize();
  void NotifyWindowWillMove(const gfx::Rect& new_bounds, bool* prevent_default);
  void NotifyWindowMoved();
  void NotifyWindowScrollTouchBegin();
  void NotifyWindowScrollTouchEnd();
  void NotifyWindowSwipe(const std::string& direction);
  void NotifyWindowSheetBegin();
  void NotifyWindowSheetEnd();
  void NotifyWindowEnterFullScreen();