Remove eugenebut from Tab.StateAtRendererTermination histogram owners

Change-Id: I64cb7e84946575ebf0116733a1e49bfaf1525d3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2638782Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845196}

tools/metrics/histograms/histograms_xml/tab/histograms.xml

@@ -456,7 +456,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 
 <histogram name="Tab.StateAtRendererTermination" enum="TabForegroundState"
     expires_after="2021-07-04">
-  <owner>eugenebut@chromium.org</owner>
+  <owner>gambard@chromium.org</owner>
   <owner>olivierrobin@chromium.org</owner>
   <summary>
     The state (foreground/background) of a tab when its renderer is terminated.