Clean up Media_* actions by marking them obsolete and not_user_trigerred.

tools/metrics/actions/actions.xml

 <!--
 Copyright 2014 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 
 <!--
 This file is a comprehensive list of Chrome user actions along with the owner
 and description for each user action. A user action should be tied to an actual
 action taken by a user. It should be logged immediately after a user takes the
@@ skipping 8539 matching lines @@
 </action>
 
 <action name="MediaRouter_Ui_Navigate_SinkListToSource">
   <owner>apacible@chromium.org</owner>
   <description>
     User explicitly clicked to navigate from the sink view to the cast mode
     view.
   </description>
 </action>
 
-<action name="Media_Paused">
+<action name="Media_Paused" not_user_triggered="true">

[Ilya Sherman, 2016/07/25 18:41:58]

nit: Seems like the not_user_triggered flag shouldn't be needed if the action is
obsolete.  (Ditto for the others.)

[mlamouri (slow - plz ping), 2016/07/26 17:29:52]

Maybe it's better to mark them properly even if it is retroactive? I want to
make sure the tool I'm using will not show these actions even if they were
registered.

[Ilya Sherman, 2016/07/26 19:17:24]

It's not entirely obvious to me that it's "correct" to mark these as
non-user-triggered (since I'd imagine they typically are)... but I also don't
feel very strongly about this, so LGTM.

   <owner>liberato@chromium.org</owner>
-  <description>Media playback was paused.</description>
+  <description>
+    Media playback was paused, either from script or controls.
+  </description>
+  <obsolete>No longer recorded.</obsolete>
 </action>
 
 <action name="Media_Play_WithGesture">
   <owner>liberato@chromium.org</owner>
   <description>A call to play() with a user gesture succeeded.</description>
+  <obsolete>No longer recorded.</obsolete>
 </action>
 
-<action name="Media_Playback_Ended">
+<action name="Media_Playback_Ended" not_user_triggered="true">
   <owner>liberato@chromium.org</owner>
   <description>Media playback reached the end.</description>
 </action>
 
-<action name="Media_Playback_Mute_Off">
+<action name="Media_Playback_Mute_Off" not_user_triggered="true">
   <owner>liberato@chromium.org</owner>
-  <description>Mute was turned off.</description>
+  <description>
+    Mute was turned off, either from script or controls.
+  </description>
+  <obsolete>No longer recorded.</obsolete>
 </action>
 
-<action name="Media_Playback_Mute_On">
+<action name="Media_Playback_Mute_On" not_user_triggered="true">
   <owner>liberato@chromium.org</owner>
-  <description>Mute was turned on.</description>
+  <description>Mute was turned on, either from script or controls.</description>
+  <obsolete>No longer recorded.</obsolete>
 </action>
 
-<action name="Media_Playback_Started">
+<action name="Media_Playback_Started" not_user_triggered="true">
   <owner>liberato@chromium.org</owner>
   <description>Media playback started due to any cause.</description>
+  <obsolete>No longer recorded.</obsolete>
 </action>
 
 <action name="Media_RequestRemotePlayback">
   <owner>liberato@chromium.org</owner>
   <description>
     User requested to transfer playback to a remote player, via 'cast' button.
   </description>
+  <obsolete>No longer recorded.</obsolete>
 </action>
 
 <action name="Media_RequestRemotePlayback_Control">
   <owner>liberato@chromium.org</owner>
   <description>
     User requested to control playback of a remote player, such as Chromecast.
   </description>
+  <obsolete>No longer recorded.</obsolete>
 </action>
 
-<action name="Media_Seeked">
+<action name="Media_Seeked" not_user_triggered="true">
   <owner>liberato@chromium.org</owner>
-  <description>Seek to different time completed.</description>
+  <description>Seek originating from script or controls completed.</description>
+  <obsolete>No longer recorded.</obsolete>
 </action>
 
-<action name="Media_SetVolume">
+<action name="Media_SetVolume" not_user_triggered="true">
   <owner>liberato@chromium.org</owner>
-  <description>Playback volume was changed.</description>
+  <description>
+    Playback volume was changed, either from script or controls.
+  </description>
+  <obsolete>No longer recorded.</obsolete>
 </action>
 
 <action name="Menu_Take_Screenshot">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="MinButton_Clk">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
@@ skipping 6634 matching lines @@
 <action name="webapps.AddShortcut.Manifest">
   <owner>mlamouri@chromium.org</owner>
   <description>
     Shortcut added to the homescreen with a valid Manifest. This action will be
     recorded in addition to AppShortcut, AppShortcutApple and Bookmark actions
     to keep a trend of whether the webapp also add meta tags.
   </description>
 </action>
 
 </actions>