LibWeb: Remove unused BrowsingContext::scroll_offset_did_change()

Author: https://github.com/awesomekling
Commit: 413cc1774e
Pull-request: https://github.com/SerenityOS/serenity/pull/21167
Reviewed-by: https://github.com/AtkinsSJ ✅

Userland/Libraries/LibWeb/HTML/BrowsingContext.h

@@ -203,8 +203,6 @@ private:
 
     void reset_cursor_blink_cycle();
 
-    void scroll_offset_did_change();
-
     WeakPtr<Page> m_page;
 
     Web::EventHandler m_event_handler;