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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,
                                     v8::Local<v8::Object> context,
                                     v8::Local<v8::Function> register_cb) {
  v8::HandleScope handle_scope(thrower.isolate());
  v8::Context::Scope context_scope(context->CreationContext());
  blink::WebCustomElement::EmbedderNamesAllowedScope embedder_names_scope;
  auto* render_frame = GetRenderFrame(window);
  if (!render_frame) {
    thrower.ThrowError(
        "Render frame was torn down before "
        "webFrame.allowGuestViewElementDefinition could be executed");
    return;
  }
  render_frame->GetWebFrame()->RequestExecuteV8Function(
      context->CreationContext(), register_cb, v8::Null(thrower.isolate()), 0,
      nullptr, nullptr);
}
int GetWebFrameId(v8::Local<v8::Value> window,