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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
preference_.FindKeyOfType(options::kCustomArgs, base::Value::Type::LIST);
  if (customArgs) {
    for (const auto& customArg : customArgs->GetList()) {
      if (customArg.is_string())
        command_line->AppendArg(customArg.GetString());
    }
  }
  
  
  
  if (IsEnabled(options::kOffscreen)) {
    command_line->AppendSwitch(options::kOffscreen);
  }
#if defined(OS_MAC)
  
  if (IsEnabled(options::kScrollBounce))
    command_line->AppendSwitch(switches::kScrollBounce);
#endif
  
  auto* args =
      preference_.FindKeyOfType("commandLineSwitches", base::Value::Type::LIST);
  if (args) {
    for (const auto& arg : args->GetList()) {
      if (arg.is_string()) {
        const auto& arg_val = arg.GetString();
        if (!arg_val.empty())
          command_line->AppendSwitch(arg_val);
      }
    }
  }