Change owner and extend update histograms

Bug: 1151987
Change-Id: I14dcbeed057904f093694d57be5755ef8737af7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2600908
Auto-Submit: Miriam Polzer <mpolzer@google.com>
Reviewed-by: Saurabh Nijhara <snijhara@google.com>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Commit-Queue: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842668}

tools/metrics/histograms/histograms_xml/update_engine/histograms.xml

@@ -598,7 +598,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 <histogram
     name="UpdateEngine.SuccessfulUpdate.DurationFromSeenDays.NoTimeRestriction"
     units="days" expires_after="2021-05-09">
-  <owner>mpolzer@google.com</owner>
+  <owner>snijhara@google.com</owner>
   <owner>managed-platforms@google.com</owner>
   <summary>
     The total number of days from when an update is first seen to when an update
@@ -612,8 +612,8 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 
 <histogram
     name="UpdateEngine.SuccessfulUpdate.DurationFromSeenDays.TimeRestricted"
-    units="days" expires_after="2021-01-01">
-  <owner>mpolzer@google.com</owner>
+    units="days" expires_after="2021-05-09">
+  <owner>snijhara@google.com</owner>
   <owner>managed-platforms@google.com</owner>
   <summary>
     The total number of days from when an update is first seen to when an update