Remove MediaThrottler and MediaThrottleInfoBar

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 573a82fc85f79fa58b750b1d80785fba34266952..fe9eac180ff41e2373999f82fe9b55a3e527fa35 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -25659,6 +25659,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Media.Android.NumMediaServerCrashes">
+  <obsolete>
+    Deprecated as of 04/2017
+  </obsolete>
   <owner>qinmin@chromium.org</owner>
   <summary>
     Android: Number of consecutive media server crashes monitored before it is
@@ -25669,6 +25672,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="Media.Android.ThrottleInfobarResponse"
     enum="ThrottleInfobarResponse">
+  <obsolete>
+    Deprecated as of 04/2017
+  </obsolete>
   <owner>qinmin@chromium.org</owner>
   <summary>
     Android: The distribution of responses to the media throttle infobar prompt.