Remove WebUI NTP on Android.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 9f6ba24ed2865faee434dacc2a67b5bb07ea5086..918f3eec9f116d655b29a2fa66da9e99055feaa5 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -15811,6 +15811,9 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 
 <histogram name="NewTabPage.BookmarkActionAndroid"
     enum="NewTabPageBookmarkActionAndroid">
+  <obsolete>
+    Deprecated on M33 with the change to native NTP.
+  </obsolete>
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>
     Actions taken by users on partner bookmarks (editing / renaming) on the NTP
@@ -15840,6 +15843,9 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 </histogram>
 
 <histogram name="NewTabPage.MobilePromo" enum="NewTabPageMobilePromo">
+  <obsolete>
+    Deprecated on M33 with the change to native NTP.
+  </obsolete>
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>
     Android: Tallies counts for how the user interacted with the NTP promo page.