[Background Sync/Fetch] Extend histogram expiration

Bug: 1037426, 1036959, 1036957, 1036958
Change-Id: I24a3d11293472f078606de7ce0ab1e05b2c47adc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1983237Reviewed-by: Nik Bhagat <nikunjb@chromium.org>
Commit-Queue: Rayan Kanso <rayankans@chromium.org>
Auto-Submit: Rayan Kanso <rayankans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728168}

tools/metrics/histograms/histograms.xml

@@ -14765,7 +14765,7 @@ uploading your change for review.
 </histogram>
 
 <histogram name="BackgroundFetch.HasDuplicateRequests" enum="Boolean"
-    expires_after="M81">
+    expires_after="M84">
   <owner>rayankans@chromium.org</owner>
   <summary>
     Records whether the fetch requests contains any duplicate URLs. This is
@@ -14786,7 +14786,7 @@ uploading your change for review.
 </histogram>
 
 <histogram name="BackgroundFetch.IncompleteFetchesOnStartup" units="units"
-    expires_after="M81">
+    expires_after="M84">
   <owner>rayankans@chromium.org</owner>
   <summary>
     Records the number of Background Fetch registrations found on browser
@@ -14796,7 +14796,7 @@ uploading your change for review.
 </histogram>
 
 <histogram base="true" name="BackgroundFetch.Manager" units="ms"
-    expires_after="M81">
+    expires_after="M84">
 <!-- Name completed by histogram_suffixes name="BackgroundFetchManagerAPIsDuration" -->
 
   <owner>rayankans@chromium.org</owner>
@@ -14882,7 +14882,7 @@ uploading your change for review.
 </histogram>
 
 <histogram base="true" name="BackgroundFetch.Storage"
-    enum="BackgroundFetchStorageError" expires_after="M81">
+    enum="BackgroundFetchStorageError" expires_after="M84">
 <!-- Name completed by histogram_suffixes name="BackgroundFetchDatabaseStorageErrors" -->
 
   <owner>rayankans@chromium.org</owner>