Deprecating AutoplayExperimentHelper

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 2b27cb685bbb799ba897cf6f4ca8a0e6071ab96e..59dad9acef2c8bea253237bdc8d08dc13628e2b0 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -4177,14 +4177,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
-<histogram name="Blink.MediaElement.Autoplay" enum="MediaElementAutoPlay">
-  <owner>oysteine@chromium.org</owner>
-  <summary>
-    Records user observation and interaction with Media HTML elements that
-    feature autoplay, either script-controlled or through the attribute.
-  </summary>
-</histogram>
-
 <histogram name="Blink.MemoryCache.RevalidationPolicy"
     enum="RevalidationPolicy">
   <owner>hiroshige@chromium.org</owner>
@@ -93061,36 +93053,6 @@ value.
   <int value="1" label="Clicked"/>
 </enum>
 
-<enum name="MediaElementAutoPlay" type="int">
-  <int value="0" label="Media element with autoplay seen"/>
-  <int value="1"
-      label="Autoplay enabled and user stopped media play at any point"/>
-  <int value="2"
-      label="Autoplay enabled but user bailed out on media play early"/>
-  <int value="3" label="Autoplay disabled but user manually started media"/>
-  <int value="4"
-      label="Autoplay enabled through a user-gesture triggered load() call."/>
-  <int value="5" label="Autoplay disabled by sandbox flags."/>
-  <int value="6" label="Gesture requirement overridden during initial load."/>
-  <int value="7" label="Gesture requirement overridden in play()."/>
-  <int value="8"
-      label="Gesture req. overridden after scroll for deferred attribute."/>
-  <int value="9"
-      label="Gesture req. overridden after scroll for deferred play()."/>
-  <int value="10" label="play() call failed due to gesture requirement."/>
-  <int value="11" label="Any playback started."/>
-  <int value="12" label="Any playback paused."/>
-  <int value="13" label="Any playback bailed out."/>
-  <int value="14" label="Any playback completed."/>
-  <int value="15" label="Any audio element encountered."/>
-  <int value="16" label="Any video element encountered."/>
-  <int value="17" label="Autoplayed media complete."/>
-  <int value="18" label="Gestureless playback started due to load()."/>
-  <int value="19" label="Gesture requirement overridden for media stream."/>
-  <int value="20" label="Gesture requirement overridden, unknown reason."/>
-  <int value="21" label="Gesture requirement overridden by play method."/>
-</enum>
-
 <enum name="MediaGalleriesUsageType" type="int">
   <int value="0" label="Gallery added from permission dialog"/>
   <int value="1" label="Gallery permission added from permission dialog"/>