* **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/api/atom_api_top_level_window.cc
.SetMethod("mergeAllWindows", &TopLevelWindow::MergeAllWindows)
      .SetMethod("moveTabToNewWindow", &TopLevelWindow::MoveTabToNewWindow)
      .SetMethod("toggleTabBar", &TopLevelWindow::ToggleTabBar)
      .SetMethod("addTabbedWindow", &TopLevelWindow::AddTabbedWindow)
      .SetMethod("setWindowButtonVisibility",
                 &TopLevelWindow::SetWindowButtonVisibility)
#endif
      .SetMethod("setAutoHideMenuBar", &TopLevelWindow::SetAutoHideMenuBar)
      .SetMethod("isMenuBarAutoHide", &TopLevelWindow::IsMenuBarAutoHide)
      .SetMethod("setMenuBarVisibility", &TopLevelWindow::SetMenuBarVisibility)
      .SetMethod("isMenuBarVisible", &TopLevelWindow::IsMenuBarVisible)
      .SetMethod("setAspectRatio", &TopLevelWindow::SetAspectRatio)
      .SetMethod("previewFile", &TopLevelWindow::PreviewFile)
      .SetMethod("closeFilePreview", &TopLevelWindow::CloseFilePreview)
      .SetMethod("getContentView", &TopLevelWindow::GetContentView)
      .SetMethod("getParentWindow", &TopLevelWindow::GetParentWindow)
      .SetMethod("getChildWindows", &TopLevelWindow::GetChildWindows)
      .SetMethod("getBrowserView", &TopLevelWindow::GetBrowserView)
      .SetMethod("getBrowserViews", &TopLevelWindow::GetBrowserViews)
      .SetMethod("isModal", &TopLevelWindow::IsModal)
      .SetMethod("setThumbarButtons", &TopLevelWindow::SetThumbarButtons)
#if defined(TOOLKIT_VIEWS)
      .SetMethod("setIcon", &TopLevelWindow::SetIcon)
#endif
#if defined(OS_WIN)
      .SetMethod("hookWindowMessage", &TopLevelWindow::HookWindowMessage)
      .SetMethod("isWindowMessageHooked",
                 &TopLevelWindow::IsWindowMessageHooked)
      .SetMethod("unhookWindowMessage", &TopLevelWindow::UnhookWindowMessage)
      .SetMethod("unhookAllWindowMessages",