Update SpellCheck.SpellingService.RequestDuration expiry

Bug: 1160834
Change-Id: I28260daab4ca6e04c7772413106d80b49eaf5fb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2600037Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Megan Jablonski <megjablon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838703}

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

@@ -14650,7 +14650,7 @@ should be kept until we remove incident reporting. -->
 </histogram>
 
 <histogram name="SpellCheck.SpellingService.RequestDuration" units="ms"
-    expires_after="2021-01-31">
+    expires_after="2021-04-04">
   <owner>yyushkina@google.com</owner>
   <owner>gujen@google.com</owner>
   <owner>chrome-language@google.com</owner>
@@ -14662,7 +14662,7 @@ should be kept until we remove incident reporting. -->
 </histogram>
 
 <histogram name="SpellCheck.SpellingService.RequestHttpResponseCode"
-    enum="HttpResponseCode" expires_after="2021-04-11">
+    enum="HttpResponseCode" expires_after="2021-04-04">
   <owner>yyushkina@google.com</owner>
   <owner>gujen@google.com</owner>
   <owner>chrome-language@google.com</owner>