[ios] Extends histograms duration

Bug: 1165271, 1165034
Change-Id: Ie4e2419decac57a32c9ddebce5a7bd237c8c55ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625828
Auto-Submit: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843012}

tools/metrics/histograms/histograms_xml/content/histograms.xml

@@ -908,7 +908,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="ContentSuggestions.Feed.Network.Duration.{NetworkEvent}"
-    units="ms" expires_after="M90">
+    units="ms" expires_after="2022-01-13">
   <owner>sczs@chromium.org</owner>
   <owner>harringtond@chromium.org</owner>
   <owner>feed@chromium.org</owner>

tools/metrics/histograms/histograms_xml/search/histograms.xml

@@ -1216,7 +1216,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Search.iOS.SelectDefaultSearchEngine"
-    enum="OmniboxSearchEngineType" expires_after="2021-02-04">
+    enum="OmniboxSearchEngineType" expires_after="2022-02-04">
   <owner>sczs@chromium.org</owner>
   <owner>gambard@chromium.org</owner>
   <summary>