* **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
NativeWindowHandle handle = window_->GetNativeWindowHandle();
  return ToBuffer(isolate(), &handle, sizeof(handle));
}
void TopLevelWindow::SetProgressBar(double progress, mate::Arguments* args) {
  mate::Dictionary options;
  std::string mode;
  args->GetNext(&options) && options.Get("mode", &mode);
  NativeWindow::ProgressState state = NativeWindow::PROGRESS_NORMAL;
  if (mode == "error")
    state = NativeWindow::PROGRESS_ERROR;
  else if (mode == "paused")
    state = NativeWindow::PROGRESS_PAUSED;
  else if (mode == "indeterminate")
    state = NativeWindow::PROGRESS_INDETERMINATE;
  else if (mode == "none")
    state = NativeWindow::PROGRESS_NONE;
  window_->SetProgressBar(progress, state);
}
void TopLevelWindow::SetOverlayIcon(const gfx::Image& overlay,