ash: Take the 24h clock pref into consideration when showing the time.

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',
   },
 
@@ skipping 101 matching lines @@
         'system/audio/audio_controller.h',
         'system/audio/tray_volume.cc',
         'system/audio/tray_volume.h',
         'system/brightness/brightness_controller.h',
         'system/brightness/brightness_control_delegate.h',
         'system/brightness/tray_brightness.cc',
         'system/brightness/tray_brightness.h',
         'system/network/network_controller.h',
         'system/network/tray_network.cc',
         'system/network/tray_network.h',
+        'system/power/date_format_observer.h',
         'system/power/power_status_controller.h',
         'system/power/power_supply_status.cc',
         'system/power/power_supply_status.h',
         'system/power/tray_power_date.cc',
         'system/power/tray_power_date.h',
         'system/settings/tray_settings.cc',
         'system/settings/tray_settings.h',
         'system/tray/system_tray.cc',
         'system/tray/system_tray.h',
         'system/tray/system_tray_delegate.h',
@@ skipping 284 matching lines @@
             'shell/cocoa/app-Info.plist',
           ],
           'xcode_settings': {
             'INFOPLIST_FILE': 'shell/cocoa/app-Info.plist',
           },
         }],
       ],
     },
   ],
 }