Remove 'Message center' text from ash_strings.

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"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/ash_strings.h" type="rc_header">
@@ skipping 432 matching lines @@
       <message name="IDS_ASH_STATUS_TRAY_NOTIFICATIONS" desc="The accessible text for the notifications button.">
         Notifications
       </message>
       <message name="IDS_ASH_STATUS_TRAY_REMAINING_SESSION_TIME" desc="The time remaining until the end of the session. Shown if the session length is limited.">
         <ph name="hours">$1<ex>01</ex></ph>:<ph name="minutes">$2<ex>35</ex></ph>:<ph name="seconds">$3<ex>12</ex></ph>
       </message>
 
       <message name="IDS_ASH_STATUS_TRAY_PREVIOUS_MENU" desc="The accessible text for header entries for detailed versions of status tray items.">
         Previous menu
       </message>
-      <message name="IDS_ASH_WEB_NOTIFICATION_TRAY_ACCESSIBLE_NAME" desc="The accessible name of the web notification tray (message center).">
-        Message Center
-      </message>
 
       <message name="IDS_ASH_MAXIMIZE_WINDOW" desc="A help text to show that when the button gets clicked the window get maximized.">
         Maximize
       </message>
       <message name="IDS_ASH_SNAP_WINDOW_RIGHT" desc="A help text to show that when the button gets clicked the window get snapped to the right side.">
         Right
       </message>
       <message name="IDS_ASH_SNAP_WINDOW_LEFT" desc="A help text to show that when the button gets clicked the window get snapped to the left side.">
         Left
       </message>
@@ skipping 18 matching lines @@
 
       <!-- ChromeOS-specific strings -->
       <if expr="pp_ifdef('chromeos')">
         <part file="ash_chromeos_strings.grdp" />
       </if>
 
     </messages>
   </release>
 </grit>