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### Issue Details

* **Electron Version:**
  * 10.1.3
* **Operating System:**
  * win7 sp1 x64

- without worldSafeExecuteJavaScript, `(webFrame|webContents).executeJavaScript('new Promise(resolve => setTimeout(() => resolve(2), 3000));')` works as expected; the executeJavaScript promise waits for the eval promise.
- in the case of webFrame the evaled promise is returned raw
- in the case of webContents the promise is marshaled
- with worldSafeExecuteJavaScript, both error with: "An object could not be cloned"
- webContents should continue marshaling promises, otherwise its an unnecessary breaking change
- webFrame should marshal promises for consistency with webContents
- the clone restriction would be on the promise resolve value

### To Reproduce
`(webFrame|webContents).executeJavaScript('new Promise(resolve => setTimeout(() => resolve(2), 3000));')`


shell/browser/web_contents_preferences.cc
SetDefaultBoolIfUndefined(options::kAllowRunningInsecureContent, true);
  } else {
    SetDefaultBoolIfUndefined(options::kAllowRunningInsecureContent, false);
  }
#if defined(OS_MAC)
  SetDefaultBoolIfUndefined(options::kScrollBounce, false);
#endif
  SetDefaultBoolIfUndefined(options::kOffscreen, false);
#if BUILDFLAG(ENABLE_BUILTIN_SPELLCHECKER)
  SetDefaultBoolIfUndefined(options::kSpellcheck, true);
#endif
  
  
  int guest_instance_id = 0;
  if (web_preferences.Get(options::kGuestInstanceID, &guest_instance_id)) {
    auto* manager = WebViewManager::GetWebViewManager(web_contents);
    if (manager) {
      auto* embedder = manager->GetEmbedder(guest_instance_id);
      if (embedder) {
        auto* embedder_preferences = WebContentsPreferences::From(embedder);
        if (embedder_preferences &&
            embedder_preferences->IsEnabled(options::kOffscreen)) {
          preference_.SetKey(options::kOffscreen, base::Value(true));
        }
      }
    }
  }
  SetDefaults();
}
WebContentsPreferences::~WebContentsPreferences() {