Remove enable Drive offline system tray UI.

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',
   },
   'includes': [
@@ skipping 226 matching lines @@
         'system/bluetooth/tray_bluetooth.cc',
         'system/bluetooth/tray_bluetooth.h',
         'system/brightness_control_delegate.h',
         'system/chromeos/audio/tray_audio.cc',
         'system/chromeos/audio/tray_audio.h',
         'system/chromeos/enterprise/enterprise_domain_observer.h',
         'system/chromeos/brightness/brightness_controller_chromeos.cc',
         'system/chromeos/brightness/brightness_controller_chromeos.h',
         'system/chromeos/brightness/tray_brightness.cc',
         'system/chromeos/brightness/tray_brightness.h',
-        'system/chromeos/drive/tray_drive_notice.cc',
-        'system/chromeos/drive/tray_drive_notice.h',
         'system/chromeos/enterprise/tray_enterprise.h',
         'system/chromeos/enterprise/tray_enterprise.cc',
         'system/chromeos/keyboard_brightness_controller.cc',
         'system/chromeos/keyboard_brightness_controller.h',
         'system/chromeos/label_tray_view.h',
         'system/chromeos/label_tray_view.cc',
         'system/chromeos/managed/tray_locally_managed_user.h',
         'system/chromeos/managed/tray_locally_managed_user.cc',
         'system/chromeos/network/network_connect.cc',
         'system/chromeos/network/network_connect.h',
@@ skipping 539 matching lines @@
         'shell/shell_delegate_impl.h',
         'shell/widgets.cc',
         'shell/window_type_launcher.cc',
         'shell/window_type_launcher.h',
         'shell/window_watcher.cc',
         'shell/window_watcher.h',
         'shell/window_watcher_launcher_item_delegate.cc',
         'shell/window_watcher_launcher_item_delegate.h',
         'shell/window_watcher_unittest.cc',
         'shell_unittest.cc',
-        'system/chromeos/drive/tray_drive_unittest.cc',
         'system/chromeos/managed/tray_locally_managed_user_unittest.cc',
         'system/chromeos/network/network_state_notifier_unittest.cc',
         'system/chromeos/power/power_event_observer_unittest.cc',
         'system/chromeos/power/power_status_unittest.cc',
         'system/chromeos/power/tray_power_unittest.cc',
         'system/chromeos/screen_security/screen_tray_item_unittest.cc',
         'system/chromeos/tray_display_unittest.cc',
         'system/date/date_view_unittest.cc',
         'system/tray/system_tray_unittest.cc',
         'system/user/tray_user_unittest.cc',
@@ skipping 169 matching lines @@
             },
           },
           'dependencies': [
             '../sandbox/sandbox.gyp:sandbox',
           ],
         }],
       ],
     },
   ],
 }