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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
content::WebContents* web_contents) {
  if (!web_contents)
    return nullptr;
  return FromWebContents(web_contents);
}
void WebContentsPreferences::AppendCommandLineSwitches(
    base::CommandLine* command_line,
    bool is_subframe) {
  
  if (IsEnabled(options::kExperimentalFeatures))
    command_line->AppendSwitch(
        ::switches::kEnableExperimentalWebPlatformFeatures);
  
  
  bool can_sandbox_frame =
      is_subframe && !IsEnabled(options::kNodeIntegrationInSubFrames);
  if (IsEnabled(options::kSandbox) || can_sandbox_frame) {
    command_line->AppendSwitch(switches::kEnableSandbox);
  } else if (!command_line->HasSwitch(switches::kEnableSandbox)) {
    command_line->AppendSwitch(sandbox::policy::switches::kNoSandbox);
    command_line->AppendSwitch(::switches::kNoZygote);
  }
  
  auto* customArgs =