iph: extends iph snooze histogram to expire after M91

Bug: 1121399
Change-Id: Ibaf60f987b9bd308c715d01a8f9ef08aec7a57be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2622319Reviewed-by: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Keren Zhu <kerenzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843160}

tools/metrics/histograms/histograms_xml/others/histograms.xml

@@ -7227,7 +7227,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="InProductHelp.Promos.Snooze" units="SnoozeType"
-    expires_after="M88">
+    expires_after="M91">
 <!-- Name completed by histogram_suffixes name="IPHFeatures" -->
 
   <owner>kerenzhu@chromium.org</owner>
@@ -7240,7 +7240,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="InProductHelp.Promos.SnoozeCountAtAcknowledge" units="times"
-    expires_after="M88">
+    expires_after="M91">
 <!-- Name completed by histogram_suffixes name="IPHFeatures" -->
 
   <owner>kerenzhu@chromium.org</owner>
@@ -7252,7 +7252,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="InProductHelp.Promos.SnoozeCountAtFollow" units="times"
-    expires_after="M88">
+    expires_after="M91">
 <!-- Name completed by histogram_suffixes name="IPHFeatures" -->
 
   <owner>kerenzhu@chromium.org</owner>
@@ -7265,7 +7265,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="InProductHelp.Promos.SnoozeCountAtTrigger" units="times"
-    expires_after="M88">
+    expires_after="M91">
 <!-- Name completed by histogram_suffixes name="IPHFeatures" -->
 
   <owner>kerenzhu@chromium.org</owner>