<!--  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
prefs->webgl1_enabled = is_webgl_enabled;
  prefs->webgl2_enabled = is_webgl_enabled;
  
  bool is_web_security_enabled =
      IsEnabled(options::kWebSecurity, true );
  prefs->web_security_enabled = is_web_security_enabled;
  prefs->allow_running_insecure_content =
      IsEnabled(options::kAllowRunningInsecureContent,
                !is_web_security_enabled );
  auto* fonts_dict = preference_.FindKeyOfType("defaultFontFamily",
                                               base::Value::Type::DICTIONARY);
  if (fonts_dict) {
    base::string16 font;
    if (GetAsString(fonts_dict, "standard", &font))
      prefs->standard_font_family_map[blink::web_pref::kCommonScript] = font;
    if (GetAsString(fonts_dict, "serif", &font))
      prefs->serif_font_family_map[blink::web_pref::kCommonScript] = font;
    if (GetAsString(fonts_dict, "sansSerif", &font))
      prefs->sans_serif_font_family_map[blink::web_pref::kCommonScript] = font;
    if (GetAsString(fonts_dict, "monospace", &font))
      prefs->fixed_font_family_map[blink::web_pref::kCommonScript] = font;
    if (GetAsString(fonts_dict, "cursive", &font))
      prefs->cursive_font_family_map[blink::web_pref::kCommonScript] = font;
    if (GetAsString(fonts_dict, "fantasy", &font))
      prefs->fantasy_font_family_map[blink::web_pref::kCommonScript] = font;
  }
  int size;
  if (GetAsInteger(&preference_, "defaultFontSize", &size))
    prefs->default_font_size = size;
  if (GetAsInteger(&preference_, "defaultMonospaceFontSize", &size))