Remove dead histograms and actions

tools/metrics/actions/actions.xml

Index: tools/metrics/actions/actions.xml
diff --git a/tools/metrics/actions/actions.xml b/tools/metrics/actions/actions.xml
index f56848e6bd6fba98efc5505558f69d9adad29728..cb2f873a10d7f0f02f504d8255c49d15474dacf0 100644
--- a/tools/metrics/actions/actions.xml
+++ b/tools/metrics/actions/actions.xml
@@ -9011,11 +9011,13 @@ should be able to be added at any place in this file.
   <description>
     Recorded when the NPAPI removal infobar link is clicked.
   </description>
+  <obsolete>Deprecated due to NPAPI removal.</obsolete>
 </action>
 
 <action name="NPAPIRemovalInfobar.Shown">
   <owner>wfh@chromium.org</owner>
   <description>Recorded when the NPAPI removal infobar is shown.</description>
+  <obsolete>Deprecated due to NPAPI removal.</obsolete>
 </action>
 
 <action name="NTPPromoClosed">
@@ -11672,11 +11674,13 @@ should be able to be added at any place in this file.
 <action name="PluginLoaderPosix.LaunchUtilityProcess">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
+  <obsolete>Deprecated due to NPAPI removal.</obsolete>
 </action>
 
 <action name="PluginLoaderPosix.UtilityProcessCrashed">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
+  <obsolete>Deprecated due to NPAPI removal.</obsolete>
 </action>
 
 <action name="Plugin_200ForByteRange">
@@ -11729,6 +11733,7 @@ should be able to be added at any place in this file.
 <action name="Plugin_NPAPINotSupported">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
+  <obsolete>Deprecated due to NPAPI removal.</obsolete>
 </action>
 
 <action name="Precache.Fetch.IntentReceived" not_user_triggered="true">