Extend deadline for SB2.RemoteCall.CheckDelta

Fixed: 1138405
Change-Id: I2f6b74468f61b7f13fec47b58598536d47067832
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2476909
Auto-Submit: Varun Khaneja <vakh@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Commit-Queue: Caitlin Fischer <caitlinfischer@google.com>
Cr-Commit-Position: refs/heads/master@{#818195}

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

@@ -12014,7 +12014,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="SB2.RemoteCall.CheckDelta" units="microseconds"
-    expires_after="2020-11-08">
+    expires_after="2021-11-08">
   <owner>vakh@chromium.org</owner>
   <owner>csharrison@chromium.org</owner>
   <owner>chrome-safebrowsing-alerts@google.com</owner>