Revert "[Custom Tabs] Implement "Read It Later" Behind a Flag"

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 3288 matching lines @@
 <action name="CustomTabsMenuOpenSameUrl">
   <owner>ianwen@chromium.org</owner>
   <description>
     User opens the same url again after closing the previous custom tab.
   </description>
 </action>
 
 <action name="CustomTabsMenuReadItLater">
   <owner>ianwen@chromium.org</owner>
   <description>User hit &quot;read it later&quot; menu item.</description>
+  <obsolete>Deprecated as of 10/2016, this feature was removed.</obsolete>
 </action>
 
 <action name="CustomTabsRemoteViewsShown">
   <owner>ianwen@chromium.org</owner>
   <description>A RemoteViews based bottom bar was shown.</description>
 </action>
 
 <action name="CustomTabsRemoteViewsUpdated">
   <owner>ianwen@chromium.org</owner>
   <description>
@@ skipping 12536 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>