* **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_views.h
AtomDesktopWindowTreeHostWin* atom_desktop_window_tree_host_win_;
  ui::WindowShowState last_window_state_;
  gfx::Rect last_normal_placement_bounds_;
  
  
  
  
  gfx::Rect last_normal_bounds_;
  gfx::Rect last_normal_bounds_before_move_;
  
  
  
  
  
  
  gfx::Rect last_normal_bounds_candidate_;
  bool consecutive_moves_;
  
  TaskbarHost taskbar_host_;
  
  bool checked_for_a11y_support_ = false;
  
  bool thick_frame_ = true;
  
  gfx::Rect restore_bounds_;
  
  base::win::ScopedHICON window_icon_;
  base::win::ScopedHICON app_icon_;