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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
instances_.erase(std::remove(instances_.begin(), instances_.end(), this),
                   instances_.end());
}
void WebContentsPreferences::SetDefaults() {
  if (IsEnabled(options::kSandbox)) {
    SetBool(options::kNativeWindowOpen, true);
  }
  last_preference_ = preference_.Clone();
}
bool WebContentsPreferences::IsUndefined(base::StringPiece key) {
  return !preference_.FindKeyOfType(key, base::Value::Type::BOOLEAN);
}
bool WebContentsPreferences::SetDefaultBoolIfUndefined(base::StringPiece key,
                                                       bool val) {
  auto* current_value =
      preference_.FindKeyOfType(key, base::Value::Type::BOOLEAN);
  if (current_value) {
    return current_value->GetBool();
  } else {
    preference_.SetKey(key, base::Value(val));
    return val;
  }
}
void WebContentsPreferences::SetBool(base::StringPiece key, bool value) {