* **Electron Version** (output of `node_modules/.bin/electron --version`):
  * 5.0.0-beta.2
* **Operating System** (Platform and Version):
  * Windows 7 Professional (SP1)

### Expected Behavior
Not crash

### Actual behavior
Crash 3221225477

### To Reproduce
https://github.com/Gvozd/electron-quick-start/tree/issue-16883
based on electron-quick-start. only updated electron to 5.0.0-beta.2
try to open devtools from menu - crash

atom/browser/ui/views/menu_bar.cc
views::AccessiblePaneView::RemovePaneFocus();
  SetAcceleratorVisibility(false);
  auto children = GetChildrenInZOrder();
  std::set<ui::KeyboardCode> unreg;
  for (int i = 0, n = children.size(); i < n; ++i) {
    auto* button = static_cast<SubmenuButton*>(children[i]);
    bool shifted = false;
    auto keycode =
        atom::KeyboardCodeFromCharCode(button->accelerator(), &shifted);
    if (keycode != ui::VKEY_UNKNOWN && unreg.find(keycode) != unreg.end()) {
      unreg.insert(keycode);
      focus_manager()->UnregisterAccelerator(
          ui::Accelerator(keycode, ui::EF_NONE), this);
    }
  }
  focus_manager()->UnregisterAccelerator(
      ui::Accelerator(ui::VKEY_MENU, ui::EF_ALT_DOWN), this);
}
const char* MenuBar::GetClassName() const {