Extend expiration time of FLEDGE storage histograms.

Bug: 1197209
Change-Id: I8b687b2835b9b6f56a853016436b0f3094149dc6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3143872
Reviewed-by: Victor Costan <pwnall@chromium.org>
Commit-Queue: Russ Hamilton <behamilton@google.com>
Cr-Commit-Position: refs/heads/main@{#918834}
diff --git a/tools/metrics/histograms/metadata/storage/histograms.xml b/tools/metrics/histograms/metadata/storage/histograms.xml
index d668337..130db62 100644
--- a/tools/metrics/histograms/metadata/storage/histograms.xml
+++ b/tools/metrics/histograms/metadata/storage/histograms.xml
@@ -431,7 +431,7 @@
 </histogram>
 
 <histogram name="Storage.InterestGroup.DBMaintenanceTime" units="microseconds"
-    expires_after="M95">
+    expires_after="M97">
   <owner>behamilton@google.com</owner>
   <owner>pauljensen@chromium.org</owner>
   <summary>
@@ -444,7 +444,7 @@
 </histogram>
 
 <histogram name="Storage.InterestGroup.PerSiteCount" units="groups"
-    expires_after="M95">
+    expires_after="M97">
   <owner>behamilton@google.com</owner>
   <owner>pauljensen@chromium.org</owner>
   <summary>