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* [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
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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_context_bridge.cc
const v8::Local<v8::Object>& api_object,
    const v8::Local<v8::Context>& source_context,
    const v8::Local<v8::Context>& destination_context,
    context_bridge::ObjectCache* object_cache,
    bool support_dynamic_properties,
    int recursion_depth) {
  gin_helper::Dictionary api(source_context->GetIsolate(), api_object);
  {
    v8::Context::Scope destination_context_scope(destination_context);
    gin_helper::Dictionary proxy =
        gin::Dictionary::CreateEmpty(destination_context->GetIsolate());
    object_cache->CacheProxiedObject(api.GetHandle(), proxy.GetHandle());
    auto maybe_keys = api.GetHandle()->GetOwnPropertyNames(
        source_context, static_cast<v8::PropertyFilter>(v8::ONLY_ENUMERABLE));
    if (maybe_keys.IsEmpty())
      return v8::MaybeLocal<v8::Object>(proxy.GetHandle());
    auto keys = maybe_keys.ToLocalChecked();
    uint32_t length = keys->Length();
    for (uint32_t i = 0; i < length; i++) {
      v8::Local<v8::Value> key =
          keys->Get(destination_context, i).ToLocalChecked();
      if (support_dynamic_properties) {
        v8::Context::Scope source_context_scope(source_context);