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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/renderer/api/electron_api_web_frame.cc
v8::Local<v8::Value> window,
                                         const base::string16& code) {
  v8::Isolate* isolate = args->isolate();
  gin_helper::Promise<v8::Local<v8::Value>> promise(isolate);
  v8::Local<v8::Promise> handle = promise.GetHandle();
  auto* render_frame = GetRenderFrame(window);
  if (!render_frame) {
    promise.RejectWithErrorMessage(
        "Render frame was torn down before webFrame.executeJavaScript could be "
        "executed");
    return handle;
  }
  bool has_user_gesture = false;
  args->GetNext(&has_user_gesture);
  ScriptExecutionCallback::CompletionCallback completion_callback;
  args->GetNext(&completion_callback);
  auto& prefs = render_frame->GetBlinkPreferences();
  render_frame->GetWebFrame()->RequestExecuteScriptAndReturnValue(
      blink::WebScriptSource(blink::WebString::FromUTF16(code)),
      has_user_gesture,
      new ScriptExecutionCallback(std::move(promise),
                                  prefs.world_safe_execute_javascript,
                                  std::move(completion_callback)));
  return handle;
}
v8::Local<v8::Promise> ExecuteJavaScriptInIsolatedWorld(