Move low battery notification to Message Center.

ash/resources/ash_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <grit latest_public_release="0" current_release="1">
   <outputs>
     <output filename="grit/ash_resources.h" type="rc_header" context="default_100_percent">
       <emit emit_type='prepend'></emit>
     </output>
     <output filename="ash_resources_100_percent.pak" type="data_package" context="default_100_percent" />
     <output filename="ash_resources_200_percent.pak" type="data_package" context="default_200_percent" />
   </outputs>
   <release seq="1">
@@ skipping 87 matching lines @@
 
       <structure type="chrome_scaled_image" name="IDR_AURA_UBER_TRAY_ADD_MULTIPROFILE_USER" file="cros/status/multiprofiles_add.png" />
 
       <structure type="chrome_scaled_image" name="IDR_AURA_UBER_TRAY_MORE" file="cros/status/status_more.png" />
       <structure type="chrome_scaled_image" name="IDR_AURA_UBER_TRAY_OVERVIEW_MODE" file="cros/status/status_overview_mode.png" />
       <structure type="chrome_scaled_image" name="IDR_AURA_UBER_TRAY_SHUTDOWN" file="cros/status/status_shutdown.png" />
       <structure type="chrome_scaled_image" name="IDR_AURA_UBER_TRAY_SHUTDOWN_HOVER" file="cros/status/status_shutdown_hover.png" />
 
       <!-- ChromeOS specific icons -->
       <if expr="chromeos">
+        <structure type="chrome_scaled_image" name="IDR_AURA_NOTIFICATION_BATTERY_CRITICAL" file="cros/notification/notification_battery_critical_icon.png" />
+        <structure type="chrome_scaled_image" name="IDR_AURA_NOTIFICATION_BATTERY_FLUCTUATING" file="cros/notification/notification_battery_fluctuating_icon.png" />
+        <structure type="chrome_scaled_image" name="IDR_AURA_NOTIFICATION_BATTERY_LOW" file="cros/notification/notification_battery_low_icon.png" />
         <structure type="chrome_scaled_image" name="IDR_AURA_NOTIFICATION_BLUETOOTH" file="cros/notification/notification_bluetooth_icon.png" />
         <structure type="chrome_scaled_image" name="IDR_AURA_NOTIFICATION_DISPLAY" file="cros/notification/display_notification_icon.png" />
         <structure type="chrome_scaled_image" name="IDR_AURA_NOTIFICATION_LOW_POWER_CHARGER" file="cros/notification/notification_low_power_charger.png" />
         <structure type="chrome_scaled_image" name="IDR_AURA_UBER_TRAY_AUDIO_BLUETOOTH" file="cros/status/status_audio_device_bluetooth.png" />
         <structure type="chrome_scaled_image" name="IDR_AURA_UBER_TRAY_AUDIO_HDMI" file="cros/status/status_audio_device_hdmi.png" />
         <structure type="chrome_scaled_image" name="IDR_AURA_UBER_TRAY_AUDIO_HEADPHONE" file="cros/status/status_audio_device_headphones.png" />
         <structure type="chrome_scaled_image" name="IDR_AURA_UBER_TRAY_AUDIO_USB" file="cros/status/status_audio_device_usb.png" />
         <structure type="chrome_scaled_image" name="IDR_AURA_UBER_TRAY_AUTO_ROTATION" file="cros/status/status_auto_rotate.png" />
         <structure type="chrome_scaled_image" name="IDR_AURA_UBER_TRAY_AUTO_ROTATION_DARK" file="cros/status/status_auto_rotate_dark.png" />
         <structure type="chrome_scaled_image" name="IDR_AURA_UBER_TRAY_AUTO_ROTATION_LOCKED" file="cros/status/status_auto_rotate_locked.png" />
@@ skipping 95 matching lines @@
 
       <structure type="chrome_scaled_image" name="IDR_AURA_WINDOW_OVERVIEW_CLOSE" file="common/window_overview_close_normal.png" />
       <structure type="chrome_scaled_image" name="IDR_AURA_WINDOW_OVERVIEW_CLOSE_H" file="common/window_overview_close_hover.png" />
       <structure type="chrome_scaled_image" name="IDR_AURA_WINDOW_OVERVIEW_CLOSE_P" file="common/window_overview_close_pressed.png" />
 
       <structure type="chrome_scaled_image" name="IDR_AVATAR_HOLDER" file="cros/avatar_holder.png" />
       <structure type="chrome_scaled_image" name="IDR_AVATAR_HOLDER_MASK" file="cros/avatar_holder_mask.png" />
     </structures>
   </release>
 </grit>