[roll] Roll fuchsia [test] Re-land "Remove deprecated cpu_breakdown.py"

Complete migration from CpuBreakdownMetricsProcessor to
CpuMetricsProcessor.

Original-Fixed: b/375257864
Test: CQ cpu_breakdown_test agg_cpu_breakdown_test
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1146984
Original-Revision: 406d72473271137a682269a8bb6b15c6a6c20f6d
GitOrigin-RevId: 26e33b7e2c4ea7af02f85c23dc7f9679d99f4b94
Change-Id: Ia9f6e1087bb5610039c239edd2643fb03184de4d
diff --git a/stem b/stem
index 110f738..ab95423 100644
--- a/stem
+++ b/stem
@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="ab1e37368fb1d49ed0ad2fdaa5b249d59f7f40a8"/>
+             revision="406d72473271137a682269a8bb6b15c6a6c20f6d"/>
   </projects>
   <hooks>
     <hook name="install-environment"