Revert of Clears GuestModeEnabled and AddPersonEnabled user prefs if MD settings is enabled

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 14825 matching lines @@
   <description>Please enter the description of this user action.</description>
   <obsolete>Removed from codebase; see GoogleUpdate.UpgradeResult.</obsolete>
 </action>
 
 <action name="Upgrade_Started">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
   <obsolete>Removed from codebase; see GoogleUpdate.UpgradeResult.</obsolete>
 </action>
 
-<action name="UserManager_Cleared_Legacy_User_Prefs">
-  <owner>mahmadi@chromium.org</owner>
-  <description>
-    Recorded when prefs::kBrowserGuestModeEnabled and
-    prefs::kBrowserAddPersonEnabled are cleared because they no longer exist in
-    the Material Design settings page.
-  </description>
-</action>
-
 <action name="VideoPlayer.CastVideoError">
   <owner>yoshiki@chromium.org</owner>
   <description>
     Chrome OS Video Player: an error occurred upon casting.
   </description>
 </action>
 
 <action name="VideoPlayer.OpenVideoPlayer">
   <owner>yoshiki@chromium.org</owner>
   <description>
@@ skipping 477 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>