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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) {
  double result = 0.0;
  content::RenderFrame* render_frame = GetRenderFrame(window);
  if (!render_frame) {
    thrower.ThrowError(
        "Render frame was torn down before webFrame.getZoomLevel could be "
        "executed");
    return result;
  }
  mojo::Remote<mojom::ElectronBrowser> browser_remote;
  render_frame->GetBrowserInterfaceBroker()->GetInterface(
      browser_remote.BindNewPipeAndPassReceiver());
  browser_remote->DoGetZoomLevel(&result);
  return result;
}
void SetZoomFactor(gin_helper::ErrorThrower thrower,
                   v8::Local<v8::Value> window,
                   double factor) {
  if (factor < std::numeric_limits<double>::epsilon()) {
    thrower.ThrowError("'zoomFactor' must be a double greater than 0.0");
    return;
  }
  SetZoomLevel(thrower, window, blink::PageZoomFactorToZoomLevel(factor));
}
double GetZoomFactor(gin_helper::ErrorThrower thrower,
                     v8::Local<v8::Value> window) {
  double zoom_level = GetZoomLevel(thrower, window);
  return blink::PageZoomLevelToZoomFactor(zoom_level);
}
v8::Local<v8::Value> GetWebPreference(v8::Isolate* isolate,