Remove prefixed EME.

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 284498fbbee3e1cb9897c040565856c59b804d19..2ec03af8b7a332eb72994efb3bc219bf32c83057 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -19361,11 +19361,17 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Media.EME.ClearKey.addKey" enum="MediaKeyException">
+  <obsolete>
+    Deprecated 02/2016 with removal of prefixed EME.
+  </obsolete>
   <owner>xhwang@chromium.org</owner>
   <summary>addKey result using the Clear Key key system.</summary>
 </histogram>
 
 <histogram name="Media.EME.ClearKey.cancelKeyRequest" enum="MediaKeyException">
+  <obsolete>
+    Deprecated 02/2016 with removal of prefixed EME.
+  </obsolete>
   <owner>xhwang@chromium.org</owner>
   <summary>cancelKeyRequest result using the Clear Key key system.</summary>
 </histogram>
@@ -19379,22 +19385,34 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="Media.EME.ClearKey.generateKeyRequest"
     enum="MediaKeyException">
+  <obsolete>
+    Deprecated 02/2016 with removal of prefixed EME.
+  </obsolete>
   <owner>xhwang@chromium.org</owner>
   <summary>generateKeyRequest result using the Clear Key key system.</summary>
 </histogram>
 
 <histogram name="Media.EME.ClearKey.KeyAdded">
+  <obsolete>
+    Deprecated 02/2016 with removal of prefixed EME.
+  </obsolete>
   <owner>xhwang@chromium.org</owner>
   <summary>KeyAdded event count using the Clear Key key system.</summary>
 </histogram>
 
 <histogram name="Media.EME.ClearKey.KeyError" enum="MediaKeyError">
+  <obsolete>
+    Deprecated 02/2016 with removal of prefixed EME.
+  </obsolete>
   <owner>xhwang@chromium.org</owner>
   <summary>KeyError event count using the Clear Key key system.</summary>
 </histogram>
 
 <histogram name="Media.EME.KeySystemSupport.Widevine"
     enum="MediaKeySystemSupportStatus">
+  <obsolete>
+    Deprecated 02/2016 with removal of prefixed EME.
+  </obsolete>
   <owner>xhwang@chromium.org</owner>
   <summary>
     Key system support query status and result. Each enum value will be reported
@@ -19434,11 +19452,17 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Media.EME.Unknown.addKey" enum="MediaKeyException">
+  <obsolete>
+    Deprecated 02/2016 with removal of prefixed EME.
+  </obsolete>
   <owner>xhwang@chromium.org</owner>
   <summary>addKey result using an unknown key system.</summary>
 </histogram>
 
 <histogram name="Media.EME.Unknown.cancelKeyRequest" enum="MediaKeyException">
+  <obsolete>
+    Deprecated 02/2016 with removal of prefixed EME.
+  </obsolete>
   <owner>xhwang@chromium.org</owner>
   <summary>cancelKeyRequest result using an unknown key system.</summary>
 </histogram>
@@ -19451,16 +19475,25 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Media.EME.Unknown.generateKeyRequest" enum="MediaKeyException">
+  <obsolete>
+    Deprecated 02/2016 with removal of prefixed EME.
+  </obsolete>
   <owner>xhwang@chromium.org</owner>
   <summary>generateKeyRequest result using an unknown key system.</summary>
 </histogram>
 
 <histogram name="Media.EME.Unknown.KeyAdded">
+  <obsolete>
+    Deprecated 02/2016 with removal of prefixed EME.
+  </obsolete>
   <owner>xhwang@chromium.org</owner>
   <summary>KeyAdded event count using an unknown key system.</summary>
 </histogram>
 
 <histogram name="Media.EME.Unknown.KeyError" enum="MediaKeyError">
+  <obsolete>
+    Deprecated 02/2016 with removal of prefixed EME.
+  </obsolete>
   <owner>xhwang@chromium.org</owner>
   <summary>KeyError event count using an unknown key system.</summary>
 </histogram>
@@ -19479,11 +19512,17 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Media.EME.Widevine.addKey" enum="MediaKeyException">
+  <obsolete>
+    Deprecated 02/2016 with removal of prefixed EME.
+  </obsolete>
   <owner>xhwang@chromium.org</owner>
   <summary>addKey result using the Widevine key system.</summary>
 </histogram>
 
 <histogram name="Media.EME.Widevine.cancelKeyRequest" enum="MediaKeyException">
+  <obsolete>
+    Deprecated 02/2016 with removal of prefixed EME.
+  </obsolete>
   <owner>xhwang@chromium.org</owner>
   <summary>cancelKeyRequest result using the Widevine key system.</summary>
 </histogram>
@@ -19497,16 +19536,25 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="Media.EME.Widevine.generateKeyRequest"
     enum="MediaKeyException">
+  <obsolete>
+    Deprecated 02/2016 with removal of prefixed EME.
+  </obsolete>
   <owner>xhwang@chromium.org</owner>
   <summary>generateKeyRequest result using the Widevine key system.</summary>
 </histogram>
 
 <histogram name="Media.EME.Widevine.KeyAdded">
+  <obsolete>
+    Deprecated 02/2016 with removal of prefixed EME.
+  </obsolete>
   <owner>xhwang@chromium.org</owner>
   <summary>KeyAdded event count using the Widevine key system.</summary>
 </histogram>
 
 <histogram name="Media.EME.Widevine.KeyError" enum="MediaKeyError">
+  <obsolete>
+    Deprecated 02/2016 with removal of prefixed EME.
+  </obsolete>
   <owner>xhwang@chromium.org</owner>
   <summary>KeyError event count using the Widevine key system.</summary>
 </histogram>