LibWebView: Remove now-unused ProcessManager HTML generator

Author: https://github.com/trflynn89
Commit: 942f26a846
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3967
Reviewed-by: https://github.com/shannonbooth

Libraries/LibWebView/Application.h

@@ -56,10 +56,6 @@ public:
 #endif
     Optional<Process&> find_process(pid_t);
 
-    // FIXME: Should we just expose the ProcessManager via a getter?
-    void update_process_statistics();
-    String generate_process_statistics_html();
-
     void send_updated_process_statistics_to_view(ViewImplementation&);
 
     ErrorOr<LexicalPath> path_for_downloaded_file(StringView file) const;