Remove enable Drive offline system tray UI.

ash/ash_strings.grd

Index: ash/ash_strings.grd
diff --git a/ash/ash_strings.grd b/ash/ash_strings.grd
index 3580e7bea1bf050b9155dc3a29b568ec30766f62..289c8b1b3e0a4b44d2dc3552b6fb7fb80d2c6835 100644
--- a/ash/ash_strings.grd
+++ b/ash/ash_strings.grd
@@ -363,15 +363,6 @@ Press Ctrl+Alt+Z to disable.
       <message name="IDS_ASH_STATUS_TRAY_DISPLAY_ORIENTATION_270" desc="The value of display orientation option item: 270-degree rotated">
         270&#x00B0;
       </message>
-      <message name="IDS_ASH_STATUS_TRAY_DRIVE_OFFLINE_NOTICE" desc="The label in the tray notifying a first-time logged in user that they are being opted-in to Google Drive offline.">
-      Preparing Google Drive for offline... 
-      </message>
-      <message name="IDS_ASH_STATUS_TRAY_DRIVE_DISABLE_OFFLINE" desc="The label in the detailed drive offline opt-in notice tray item explaining how to disable Google Drive offline.">
-      To disable Google Drive offline on this device, adjust your settings at drive.google.com.
-      </message>
-      <message name="IDS_ASH_STATUS_TRAY_DRIVE_OFFLINE_FOOTER" desc="The label for the footer of the detailed drive offline opt-in notice tray item.">
-      Google Drive
-      </message>
       <message name="IDS_ASH_STATUS_TRAY_DRIVE_SYNCING" desc="The label in the tray to indicate onoing file sync operations.">
         Syncing <ph name="count">$1<ex>3</ex></ph> file(s)
       </message>