[NTP] Extend the expiration date for browser commands metric

This is a useful metric to monitor the adoption of the promo browser
commands.

Fixed: 1165094
Change-Id: I2df2e242cc072eb5ee74716a029eae111373584b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2632065Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844175}

tools/metrics/histograms/enums.xml

@@ -61973,6 +61973,8 @@ https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_2.7.1.pdf
 
 <enum name="PromoBrowserCommandEnum">
   <int value="0" label="Unknown Command"/>
+  <int value="1" label="Open Safety Check"/>
+  <int value="2" label="Open SafeBrowsing Enhanced Protection"/>
 </enum>
 
 <enum name="ProtectorError">

tools/metrics/histograms/histograms_xml/new_tab_page/histograms.xml

@@ -1025,7 +1025,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="NewTabPage.Promos.PromoBrowserCommand"
-    enum="PromoBrowserCommandEnum" expires_after="M90">
+    enum="PromoBrowserCommandEnum" expires_after="2022-01-01">
   <owner>mahmadi@chromium.org</owner>
   <owner>chrome-desktop-ntp@google.com</owner>
   <summary>