* 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
js_env_->OnMessageLoopCreated();
  exit_code_ = result_code;
  return content::BrowserMainParts::MainMessageLoopRun(result_code);
}
void ElectronBrowserMainParts::PreDefaultMainMessageLoopRun(
    base::OnceClosure quit_closure) {
  Browser::Get()->SetMainMessageLoopQuitClosure(std::move(quit_closure));
}
void ElectronBrowserMainParts::PostMainMessageLoopStart() {
#if defined(USE_OZONE)
  if (features::IsUsingOzonePlatform()) {
    auto shutdown_cb =
        base::BindOnce(base::RunLoop::QuitCurrentWhenIdleClosureDeprecated());
    ui::OzonePlatform::GetInstance()->PostMainMessageLoopStart(
        std::move(shutdown_cb));
  }
#endif
#if defined(OS_LINUX)
  bluez::DBusBluezManagerWrapperLinux::Initialize();
#endif
#if defined(OS_POSIX)
  HandleShutdownSignals();
#endif
}
void ElectronBrowserMainParts::PostMainMessageLoopRun() {