style: Remove the old profiler label frames code in the servo codebase and replace it with the new API

Differential Revision: https://phabricator.services.mozilla.com/D120795

components/style/driver.rs

@@ -140,7 +140,7 @@ where
                     // ensures that we process all the elements at a given depth before
                     // proceeding to the next depth, which is important for style sharing.
                     rayon::scope_fifo(|scope| {
-                        profiler_label!(Style);
+                        gecko_profiler_label!(Layout, StyleComputation);
                         parallel::traverse_nodes(
                             drain,
                             DispatchMode::TailCall,