Update histogram expiry dates

Bug: 1153761
Change-Id: I0ccd25212c03c0b62609205f3f92fb965cbb2e9b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2566732Reviewed-by: Chris Thompson <cthomp@chromium.org>
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832139}

tools/metrics/histograms/histograms_xml/safe_browsing/histograms.xml

@@ -591,7 +591,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="SafeBrowsing.DelayedWarnings.Event"
-    enum="SafeBrowsingDelayedWarningEvent" expires_after="M89">
+    enum="SafeBrowsingDelayedWarningEvent" expires_after="M91">
   <owner>meacer@chromium.org</owner>
   <owner>chrome-safebrowsing-alerts@google.com</owner>
   <summary>
@@ -604,7 +604,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="SafeBrowsing.DelayedWarnings.Event_UrlElisionDisabled"
-    enum="SafeBrowsingDelayedWarningEvent" expires_after="M89">
+    enum="SafeBrowsingDelayedWarningEvent" expires_after="M91">
   <owner>meacer@chromium.org</owner>
   <owner>chrome-safebrowsing-alerts@google.com</owner>
   <summary>