Simplify layout of tray items and fix spacing for MD.

ash/common/system/date/tray_date.h

 // 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.
 
 #ifndef ASH_COMMON_SYSTEM_DATE_TRAY_DATE_H_
 #define ASH_COMMON_SYSTEM_DATE_TRAY_DATE_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 50 matching lines @@
   void DestroyDetailedView() override;
   void UpdateAfterLoginStatusChange(LoginStatus status) override;
   void UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) override;
 
   // Overridden from ClockObserver.
   void OnDateFormatChanged() override;
   void OnSystemClockTimeUpdated() override;
   void OnSystemClockCanSetTimeChanged(bool can_set_time) override;
   void Refresh() override;
 
-  void SetupLabelForTimeTray(views::Label* label);
-
   tray::TimeView* time_tray_;
   DateDefaultView* default_view_;
   LoginStatus login_status_;
 
 #if defined(OS_CHROMEOS)
   std::unique_ptr<SystemClockObserver> system_clock_observer_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(TrayDate);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_DATE_TRAY_DATE_H_