Revert "Create and pass shared-histogram-allocator from browser to renderer."

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 6e1c8d8e80ae0a30ab797b76725157cfbd424ea8..d9d137e72ca052b6d1576ac72934fb72228b9dc7 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -54884,24 +54884,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
-<histogram name="UMA.PersistentAllocator.RendererMetrics.Allocs" units="bytes">
-  <owner>bcwhite@chromium.org</owner>
-  <owner>asvitkine@chromium.org</owner>
-  <summary>
-    Size, before padding, of objects allocated from persistent memory. This is
-    updated with every allocation.
-  </summary>
-</histogram>
-
-<histogram name="UMA.PersistentAllocator.RendererMetrics.UsedPct" units="%">
-  <owner>bcwhite@chromium.org</owner>
-  <owner>asvitkine@chromium.org</owner>
-  <summary>
-    Percentage of persistent memory segment that has been allocated. This is
-    updated only once per reporting cycle.
-  </summary>
-</histogram>
-
 <histogram name="UMA.PersistentAllocator.SetupMetrics.Allocs" units="bytes">
   <owner>bcwhite@chromium.org</owner>
   <owner>asvitkine@chromium.org</owner>
@@ -54976,16 +54958,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
-<histogram name="UMA.SubprocessMetricsProvider.SubprocessCount"
-    units="subprocesses">
-  <owner>asvitkine@chromium.org</owner>
-  <owner>bcwhite@chromium.org</owner>
-  <summary>
-    The number of subprocesses from which persistent metrics were collected,
-    logged once with every reporting cycle.
-  </summary>
-</histogram>
-
 <histogram name="UMA.SyntheticTrials.Count">
   <obsolete>
     Deprecated as of August 2015.