Rollback changes related to "Implementing popup menus with modern APIs"

The impact on WebView2Mac is mainly reflected in the remote_cocoa-related menu popup and menu control logic. Since WebView2Mac relies on the menu popup mechanism of remote_cocoa (such as HTML select control popups, context menus, etc.), this rollback means that the menu popup logic will revert to the previous implementation, undoing the adaptation to modern APIs. If downstream WebView2Mac code does not directly depend on the “modern API” interfaces being rolled back, functionality will remain consistent with the pre-rollback state, and no new compatibility issues will be introduced. If downstream code has already adapted to the new APIs, attention should be paid to the compilation or runtime compatibility impacts caused by the interface rollback. Overall, this rollback is a restoration of compatibility and will not have a significant impact on the core functionality of WebView2Mac in the short term, but attention should be paid to adaptation requirements when modern APIs are reintroduced in the future.