[ZPS] Extend expiration date for LocalHistoryZeroSuggestProvider metrics

This code is under active development and these are useful metrics for
monitoring regressions.

Fixed: 1125723
Change-Id: I6667830a5bac7671624764d5b909c37f11070a52
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2631364Reviewed-by: Mark Pearson <mpearson@chromium.org>
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844833}

tools/metrics/histograms/histograms_xml/omnibox/histograms.xml

@@ -443,7 +443,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Omnibox.LocalHistoryZeroSuggest.AsyncDeleteTime" units="ms"
-    expires_after="M87">
+    expires_after="2022-01-01">
   <owner>mahmadi@chromium.org</owner>
   <owner>tommycli@chromium.org</owner>
   <summary>
@@ -454,7 +454,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Omnibox.LocalHistoryZeroSuggest.SearchTermsExtractedCount"
-    units="count" expires_after="M87">
+    units="count" expires_after="2022-01-01">
   <owner>mahmadi@chromium.org</owner>
   <owner>tommycli@chromium.org</owner>
   <summary>
@@ -466,7 +466,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Omnibox.LocalHistoryZeroSuggest.SearchTermsExtractionTime"
-    units="ms" expires_after="M87">
+    units="ms" expires_after="2022-01-01">
   <owner>mahmadi@chromium.org</owner>
   <owner>tommycli@chromium.org</owner>
   <summary>
@@ -477,7 +477,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Omnibox.LocalHistoryZeroSuggest.SyncDeleteTime" units="ms"
-    expires_after="M87">
+    expires_after="2022-01-01">
   <owner>mahmadi@chromium.org</owner>
   <owner>tommycli@chromium.org</owner>
   <summary>