* 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
DCHECK(self_);
  return self_;
}
bool ElectronBrowserMainParts::SetExitCode(int code) {
  if (!exit_code_)
    return false;
  *exit_code_ = code;
  return true;
}
int ElectronBrowserMainParts::GetExitCode() {
  return exit_code_ != nullptr ? *exit_code_ : 0;
}
void ElectronBrowserMainParts::RegisterDestructionCallback(
    base::OnceClosure callback) {
  
  
  
  destructors_.insert(destructors_.begin(), std::move(callback));
}
int ElectronBrowserMainParts::PreEarlyInitialization() {
  field_trial_list_ = std::make_unique<base::FieldTrialList>(nullptr);
#if defined(OS_LINUX)
  OverrideLinuxAppDataPath();
#endif
#if defined(OS_POSIX)
  HandleSIGCHLD();
#endif
  return content::RESULT_CODE_NORMAL_EXIT;
}
void ElectronBrowserMainParts::PostEarlyInitialization() {