* **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
window_->Focus(false);
}
bool TopLevelWindow::IsFocused() {
  return window_->IsFocused();
}
void TopLevelWindow::Show() {
  window_->Show();
}
void TopLevelWindow::ShowInactive() {
  
  if (IsModal())
    return;
  window_->ShowInactive();
}
void TopLevelWindow::Hide() {
  window_->Hide();
}
bool TopLevelWindow::IsVisible() {
  return window_->IsVisible();
}
bool TopLevelWindow::IsEnabled() {
  return window_->IsEnabled();
}
void TopLevelWindow::SetEnabled(bool enable) {
  window_->SetEnabled(enable);
}
void TopLevelWindow::Maximize() {
  window_->Maximize();
}
void TopLevelWindow::Unmaximize() {