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 18ec5e60d2720b284088f37d63fa53619511590e..8384b4ff3a687bf59aebe4c50e5ce07389731557 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -25511,6 +25511,9 @@ 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
@@ -25521,6 +25524,9 @@ 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.