Run tools/metrics/histograms/update_use_counter_feature_enum.py

This is for https://codereview.chromium.org/1058723004/ in Blink,
to add "tabStop" property/attribute stats.

BUG=380445
TBR=isherman

Review URL: https://codereview.chromium.org/1059153002

Cr-Commit-Position: refs/heads/master@{#323890}

tools/metrics/histograms/histograms.xml

@@ -51281,6 +51281,9 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="743" label="GlobalCacheStorage"/>
   <int value="744" label="NetInfo"/>
   <int value="745" label="BackgroundSync"/>
+  <int value="746" label="TabStopProperty"/>
+  <int value="747" label="TabStopAttribute"/>
+  <int value="748" label="LegacyConst"/>
 </enum>
 
 <enum name="FFmpegCodecs" type="int">