<!--  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:**
  * 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
std::string s;
  
  if (GetAsString(&preference_, options::kEnableBlinkFeatures, &s))
    command_line->AppendSwitchASCII(::switches::kEnableBlinkFeatures, s);
  
  if (GetAsString(&preference_, options::kDisableBlinkFeatures, &s))
    command_line->AppendSwitchASCII(::switches::kDisableBlinkFeatures, s);
  if (IsEnabled(options::kNodeIntegrationInWorker))
    command_line->AppendSwitch(switches::kNodeIntegrationInWorker);
  
  
  
  last_preference_ = preference_.Clone();
}
void WebContentsPreferences::OverrideWebkitPrefs(
    blink::web_pref::WebPreferences* prefs) {
  prefs->javascript_enabled =
      IsEnabled(options::kJavaScript, true );
  prefs->images_enabled = IsEnabled(options::kImages, true );
  prefs->text_areas_are_resizable =
      IsEnabled(options::kTextAreasAreResizable, true );
  prefs->navigate_on_drag_drop =
      IsEnabled(options::kNavigateOnDragDrop, false );
  if (!GetAsAutoplayPolicy(&preference_, "autoplayPolicy",
                           &prefs->autoplay_policy)) {
    prefs->autoplay_policy =
        blink::mojom::AutoplayPolicy::kNoUserGestureRequired;
  }
  
  bool is_webgl_enabled = IsEnabled(options::kWebGL, true );