* Electron version: 8.0.0
* Operating system: Linux - Fedora 31 - Kernel 5.4.13-201.fc31.x86_64

### Expected behavior
The local store should persist items even though the app is terminated as soon as the item was added.

### Actual behavior
If the app is terminated in less than 2 seconds after an item is added to local storage, the value is not available after the app is reopened.

### How to reproduce
1. Create a new electron app 
(I used the quick start from the website git clone https://github.com/electron/electron-quick-start)

0. Run the app using `npm start`

0. Run a JavaScript code that adds a new key/value pair to localStorage
````
localStorage.setItem("my-key", "my-value")
````

0. Within 3 seconds, terminate the app (killing the process or pressing Ctrl + C)
NOTE: If the app is closed properly (pressing Alt + F4 or click on the "X"), this issue does not occur.

0. Run the app again

0. Check for the localStorage items
````
localStorage.getItem("my-key")
````
Or in the Application tab from Developer Tools.

Both cases are not available neither the key nor the value
shell/browser/electron_browser_main_parts.cc
public:
  DarkThemeObserver() = default;
  
  void OnNativeThemeUpdated(ui::NativeTheme* observed_theme) override {
    UpdateDarkThemeSetting();
  }
};
#endif
ElectronBrowserMainParts* ElectronBrowserMainParts::self_ = nullptr;
ElectronBrowserMainParts::ElectronBrowserMainParts(
    const content::MainFunctionParams& params)
    : fake_browser_process_(new BrowserProcessImpl),
      browser_(new Browser),
      node_bindings_(
          NodeBindings::Create(NodeBindings::BrowserEnvironment::kBrowser)),
      electron_bindings_(new ElectronBindings(node_bindings_->uv_loop())) {
  DCHECK(!self_) << "Cannot have two ElectronBrowserMainParts";
  self_ = this;
}
ElectronBrowserMainParts::~ElectronBrowserMainParts() {
  asar::ClearArchives();
}
ElectronBrowserMainParts* ElectronBrowserMainParts::Get() {