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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::Undefined(isolate),
              v8::Exception::Error(
                  v8::String::NewFromUtf8(isolate, error_message)
                      .ToLocalChecked()));
        }
        promise_.RejectWithErrorMessage(error_message);
      }
    } else {
      const char* error_message =
          "WebFrame was removed before script could run. This normally means "
          "the underlying frame was destroyed";
      if (!callback_.is_null()) {
        v8::Local<v8::Context> context = promise_.GetContext();
        v8::Context::Scope context_scope(context);
        std::move(callback_).Run(
            v8::Undefined(isolate),
            v8::Exception::Error(v8::String::NewFromUtf8(isolate, error_message)
                                     .ToLocalChecked()));
      }
      promise_.RejectWithErrorMessage(error_message);
    }
    delete this;
  }
 private:
  gin_helper::Promise<v8::Local<v8::Value>> promise_;
  bool world_safe_result_;
  CompletionCallback callback_;
  DISALLOW_COPY_AND_ASSIGN(ScriptExecutionCallback);
};
class FrameSetSpellChecker : public content::RenderFrameVisitor {