[histograms] Hand off ownership of UMA.ClientIdBackupRecoveredWithAge

R=asvitkine@chromium.org

Bug: 1127953
Change-Id: Iee900b43fc62f6e654fb9434033dd6a93fe12185
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2510671
Auto-Submit: Gabriel Charette <gab@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823784}

tools/metrics/histograms/histograms_xml/uma/histograms.xml

@@ -53,8 +53,8 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="UMA.ClientIdBackupRecoveredWithAge" units="hours"
-    expires_after="2020-10-25">
-  <owner>gab@chromium.org</owner>
+    expires_after="2021-02-25">
+  <owner>asvitkine@chromium.org</owner>
   <owner>src/base/metrics/OWNERS</owner>
   <summary>
     Recorded when we are somehow missing the client ID stored in Local State yet