Add new WebContentsView class as BrowserView is deprecated.

According to [Electron lastest documentation](https://www.electronjs.org/docs/latest/api/browser-view#:~:text=BrowserView-,Note%20The%20BrowserView%20class%20is%20deprecated%2C%20and%20replaced%20by%20the%20new%20WebContentsView%20class.,-A%20BrowserView%20can) the `BrowserView` class is deprecated and replaced by `WebContentsView`. Then we need `WebContentsView` in `@electron/remote` too.