Remove the drive status from the ash try.

ash/ash.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'chromium_code': 1,
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
     # These files lists are shared with the GN build.
     'ash_sources': [
@@ skipping 340 matching lines @@
       'system/chromeos/tray_tracing.h',
       'system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc',
       'system/chromeos/virtual_keyboard/virtual_keyboard_tray.h',
       'system/date/clock_observer.h',
       'system/date/date_default_view.cc',
       'system/date/date_default_view.h',
       'system/date/date_view.cc',
       'system/date/date_view.h',
       'system/date/tray_date.cc',
       'system/date/tray_date.h',
-      'system/drive/drive_observer.h',
-      'system/drive/tray_drive.cc',
-      'system/drive/tray_drive.h',
       'system/ime/ime_observer.h',
       'system/ime/tray_ime.cc',
       'system/ime/tray_ime.h',
       'system/keyboard_brightness/keyboard_brightness_control_delegate.h',
       'system/locale/locale_notification_controller.cc',
       'system/locale/locale_notification_controller.h',
       'system/overview/overview_button_tray.h',
       'system/overview/overview_button_tray.cc',
       'system/status_area_widget.cc',
       'system/status_area_widget.h',
@@ skipping 872 matching lines @@
       'conditions': [
         ['chromeos==1', {
           'dependencies': [
             '../ui/display/display.gyp:display',
           ],
         }],
       ],
     },
   ],
 }