<!--  As an open source project with a dedicated but small maintainer team, it can sometimes take a long time for issues to be addressed so please be patient and we will get back to you as soon as we can.
-->

### Preflight Checklist
<!-- Please ensure you've completed the following steps by replacing [ ] with [x]-->

* [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
* [x] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
* [x] I have searched the issue tracker for an issue that matches the one I want to file, without success.

### Issue Details

* **Electron Version:**
  * 8.0.0-beta.5
* **Operating System:**
  * Windows 10
* **Last Known Working Electron version:**
  * 8.0.0-beta,4

### Expected Behavior
http://google.com should load without any crash

### Actual Behavior
Going to http://google.com works for the first time. However, when going to the same URL after the cache has been saved in `userData`, it crashes with `3221225477` exit code. The strange thing is that when going to https://google.com, it works perfectly.

### To Reproduce
(I couldn't use Fiddle, since it saves the `userData` temporarily)
https://github.com/sentialx/electron-quick-start/tree/google-crash
Branch `google-crash`

shell/browser/atom_browser_client.cc
content::RenderFrameHost* rfh) const {
  auto* web_contents = content::WebContents::FromRenderFrameHost(rfh);
  auto* web_preferences = WebContentsPreferences::From(web_contents);
  std::string affinity;
  if (web_preferences &&
      web_preferences->GetPreference("affinity", &affinity) &&
      !affinity.empty()) {
    affinity = base::ToLowerASCII(affinity);
  }
  return affinity;
}
content::SiteInstance* AtomBrowserClient::GetSiteInstanceFromAffinity(
    content::BrowserContext* browser_context,
    const GURL& url,
    content::RenderFrameHost* rfh) const {
  std::string affinity = GetAffinityPreference(rfh);
  if (!affinity.empty()) {
    auto iter = site_per_affinities_.find(affinity);
    GURL dest_site = content::SiteInstance::GetSiteForURL(browser_context, url);
    if (iter != site_per_affinities_.end() &&
        IsSameWebSite(browser_context, iter->second, dest_site)) {
      return iter->second;
    }
  }
  return nullptr;
}
void AtomBrowserClient::ConsiderSiteInstanceForAffinity(