Remove old (dead) app list code.

ash/ash_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!--
 This file contains the strings for ash.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       output_all_resource_defines="false" source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/ash_strings.h" type="rc_header">
@@ skipping 112 matching lines @@
     <file path="common/strings/ash_strings_zh-TW.xtb" lang="zh-TW" />
   </translations>
   <release seq="1" allow_pseudo="false">
     <messages fallback_to_english="true">
       <!-- TODO add all of your "string table" messages here.  Remember to
       change nontranslateable parts of the messages into placeholders (using the
       <ph> element).  You can also use the 'grit add' tool to help you identify
       nontranslateable parts and create placeholders for them. -->
 
       <!-- TODO(zork): Only include these in Aura builds -->
-      <message name="IDS_ASH_SHELF_APP_LIST_TITLE" desc="The title used for the Ash App List in the Shelf">
-        Apps
-      </message>
-      <message name="IDS_ASH_SHELF_APP_LIST_SYNCING_TITLE" desc="The title used for the Ash App List in the Shelf to indicate loading/syncing apps.">
-        Syncing apps...
-      </message>
       <message name="IDS_ASH_SHELF_APP_LIST_LAUNCHER_TITLE" desc="The title used for the Ash Launcher in the Shelf (not mentioning 'Apps' since this is a general launcher).">
         Launcher
       </message>
       <message name="IDS_ASH_SHELF_APP_LIST_LAUNCHER_SYNCING_TITLE" desc="The title used for the Ash Launcher in the Shelf to indicate loading/syncinc apps.">
         Launcher (syncing apps...)
       </message>
       <message name="IDS_ASH_SHELF_OVERFLOW_NAME" desc="The title used for the Ash overflow button in the shelf">
         Overflow Button
       </message>
       <message name="IDS_ASH_SHELF_CONTEXT_MENU_AUTO_HIDE" desc="Title of the menu item in the context menu for auto-hiding the shelf when the current window is not maximized">
@@ skipping 298 matching lines @@
 
       <!-- ChromeOS-specific strings -->
       <if expr="chromeos">
         <part file="ash_chromeos_strings.grdp" />
       </if>
 
     </messages>
   </release>
 </grit>