Add a missing string for storage manager.

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="chromeos">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <!-- Idle logout dialog for retail mode -->
   <message name="IDS_IDLE_LOGOUT_TITLE" desc="Dialog title for the idle logout dialog. Used in retail mode only.">
     Are you still there?
   </message>
@@ skipping 2650 matching lines @@
   </message>
   <message name="IDS_OPTIONS_SETTINGS_STORAGE_CLEAR_DRIVE_CACHE_TAB_TITLE" desc="Tab title for the storage manager confirmation dialog tab to remove Google Drive offline files.">
     Offline files
   </message>
   <message name="IDS_OPTIONS_SETTINGS_STORAGE_CLEAR_DRIVE_CACHE_DIALOG_TITLE" desc="Title for the storage manager confirmation dialog tab to remove Google Drive offline files.">
     Delete offline files?
   </message>
   <message name="IDS_OPTIONS_SETTINGS_STORAGE_CLEAR_DRIVE_CACHE_DESCRIPTION" desc="Description in the storage manager confirmation dialog to remove Google Drive offline files.">
     Temporary Google Drive offline files will be deleted. Files that you’ve set as available offline won’t be deleted from this device.
   </message>
+  <message name="IDS_OPTIONS_SETTINGS_STORAGE_USER_LIST_TITLE" desc="Title for the storage manager's user list dialog.">
+    Users
+  </message>
   <message name="IDS_OPTIONS_SETTINGS_STORAGE_REMOVE_USER_DIALOG_TITLE" desc="Title for the storage manager confirmation dialog to remove a user from the device.">
     Remove User
   </message>
   <message name="IDS_OPTIONS_SETTINGS_STORAGE_REMOVE_USER_DIALOG_DESCRIPTION" desc="Description in the storage manager confirmation dialog to remove a user from the device.">
     This action will permanently delete this user’s downloads, offline files, browsing data, and Android storage. This cannot be undone.
   </message>
   <message name="IDS_OPTIONS_SETTINGS_STORAGE_REMOVE_USER_DIALOG_DESCRIPTION_WITHOUT_ANDROID" desc="Description in the storage manager confirmation dialog to remove a user from the device. This description doesn't mention Android.">
     This action will permanently delete this user’s downloads, offline files, and browsing data. This cannot be undone.
   </message>
   <message name="IDS_OPTIONS_SETTINGS_STORAGE_REMOVE_USER_DIALOG_REMOVE_BUTTON_LABEL" desc="In storage manager confirmation dialog, label for the button to delete offline files.">
@@ skipping 4186 matching lines @@
   <message name="IDS_CRITICALLY_LOW_DISK_NOTIFICATION_TITLE" desc="Title of the notification warning users that they are critically low on disk space.">
     Device disk space critically low
   </message>
   <message name="IDS_CRITICALLY_LOW_DISK_NOTIFICATION_MESSAGE" desc="Notification text warning users that they are critically low on disk space.">
     Free up disk space or device will become unresponsive.
   </message>
   <message name="IDS_LOW_DISK_NOTIFICATION_BUTTON" desc="Button on the low disk notification to open storage management.">
     Manage storage
   </message>
 </grit-part>