Update Ash network icon code and integrate with tray

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 320 matching lines @@
       </message>
       <message name="IDS_ASH_STATUS_TRAY_MOBILE_VIEW_ACCOUNT" desc="In the network popup bubble, the text of the top-up URL link.">
         View mobile account
       </message>
       <message name="IDS_ASH_STATUS_TRAY_WIFI_SCANNING_MESSAGE" desc="Scanning for wifi networks">
         Searching for Wi-Fi networks...
       </message>
       <message name="IDS_ASH_STATUS_TRAY_INITIALIZING_CELLULAR" desc="Message for the status area when initializing the cellular device.">
         Initializing cellular modem...
       </message>
+      <message name="IDS_ASH_STATUS_TRAY_CELLULAR_SCANNING" desc="Message when scanning for cellular networks">
+        Searching for cellular networks...
+      </message>
       <message name="IDS_ASH_STATUS_TRAY_SMS" desc="The label used in the status tray for SMS.">
         SMS
       </message>
       <message name="IDS_ASH_STATUS_TRAY_SMS_MESSAGES" desc="The label used in the default status tray view for SMS with the number of messages.">
         SMS messages: <ph name="MESSAGE_COUNT">$1<ex>3</ex></ph>
       </message>
       <message name="IDS_ASH_STATUS_TRAY_SMS_NUMBER" desc="Sender for SMS messagees in the system tray.">
         SMS from <ph name="PHONE_NUMBER">$1<ex>08700 776655</ex></ph>
       </message>
 
@@ skipping 220 matching lines @@
       <message name="IDS_ASH_DISPLAY_FAILURE_ON_MIRRORING" desc="An error message to show that the system failed to enter the mirroring mode.">
         Can't duplicate image on attached monitors. No matching resolution found.
       </message>
       <message name="IDS_ASH_INTERNAL_DISPLAY_NAME" desc="The name of the internal display which is shown in the display settings.">
         Internal Display
       </message>
     </messages>
   </release>
 </grit>