Refine snap scrolling on the Cards New Tab Page.

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 ef53cce66530feba00569af3322c7afaaf90a664..84d568e33ecb39c16a710885151bb280081de31c 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -89364,7 +89364,8 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="3" label="User swiped a snippet away (obsolete)"/>
   <int value="4" label="User swiped a snippet away after visiting"/>
   <int value="5" label="User swiped a snippet away without visiting"/>
-  <int value="6" label="User scrolled below the fold (max once per NTP load)"/>
+  <int value="6"
+      label="User scrolled below the fold (max once per NTP load). Obsolete."/>
 </enum>
 
 <enum name="SocketStreamConnectionType" type="int">