* **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_->SetAutoHideMenuBar(auto_hide);
}
bool TopLevelWindow::IsMenuBarAutoHide() {
  return window_->IsMenuBarAutoHide();
}
void TopLevelWindow::SetMenuBarVisibility(bool visible) {
  window_->SetMenuBarVisibility(visible);
}
bool TopLevelWindow::IsMenuBarVisible() {
  return window_->IsMenuBarVisible();
}
void TopLevelWindow::SetAspectRatio(double aspect_ratio,
                                    mate::Arguments* args) {
  gfx::Size extra_size;
  args->GetNext(&extra_size);
  window_->SetAspectRatio(aspect_ratio, extra_size);
}
void TopLevelWindow::PreviewFile(const std::string& path,
                                 mate::Arguments* args) {
  std::string display_name;
  if (!args->GetNext(&display_name))
    display_name = path;
  window_->PreviewFile(path, display_name);
}
void TopLevelWindow::CloseFilePreview() {
  window_->CloseFilePreview();
}
v8::Local<v8::Value> TopLevelWindow::GetContentView() const {