Make it harder to get ContentSettingsType histogram values wrong

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 582d49029fbca058bdb75cd8fc9c4d46a99e21e6..c1f6cef4fea4417a247c28415952ad0de749ca89 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -84262,8 +84262,13 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="22" label="App banner setting (Android only)"/>
   <int value="23" label="Site engagement setting"/>
   <int value="24" label="Durable storage setting"/>
-  <int value="25" label="Key generation setting"/>
+  <int value="25" label="Key generation setting [removed]"/>
   <int value="26" label="Background sync setting"/>
+  <int value="27" label="Bluetooth guard setting"/>
+  <int value="28" label="Autoplay setting"/>
+  <int value="29" label="Important site info setting"/>
+  <int value="30" label="Permission autoblocker data setting"/>
+  <int value="31" label="Subresource filter setting"/>
 </enum>
 
 <enum name="ContextLostReason" type="int">