Update expiry and ownership of TimeToRedirectFound histograms

Bug: chromium:1149490, chromium:1149491
Change-Id: If21180126089c7a7fe9d714a6a3c0cc09880f27d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2542045
Auto-Submit: Matthew Wang <matthewmwang@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Hugo Benichi <hugobenichi@google.com>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Matthew Wang <matthewmwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828480}

tools/metrics/histograms/histograms_xml/network/histograms.xml

@@ -374,9 +374,10 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Network.Shill.Cellular.TimeToRedirectFound" units="ms"
-    expires_after="2020-12-31">
+    expires_after="2021-12-01">
   <owner>matthewmwang@chromium.org</owner>
   <owner>hugobenichi@chromium.org</owner>
+  <owner>cros-network-metrics@google.com</owner>
   <summary>
     Chrome OS network performance metric sampling the time to determine that a
     cellular network is in a captive portal with a valid redirect URL after
@@ -794,9 +795,10 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Network.Shill.Ethernet.TimeToRedirectFound" units="ms"
-    expires_after="2020-12-31">
+    expires_after="2021-12-01">
   <owner>matthewmwang@chromium.org</owner>
   <owner>hugobenichi@chromium.org</owner>
+  <owner>cros-network-metrics@google.com</owner>
   <summary>
     Chrome OS network performance metric sampling the time to determine that an
     Ethernet network is in a captive portal with a valid redirect URL after