mash: Migrate tray date view to //ash/common types

ash/system/date/date_view.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_SYSTEM_DATE_DATE_VIEW_H_
 #define ASH_SYSTEM_DATE_DATE_VIEW_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
 #include "ash/common/system/tray/actionable_view.h"
 #include "ash/system/date/tray_date.h"
 #include "base/i18n/time_formatting.h"
 #include "base/macros.h"
 #include "base/timer/timer.h"
 #include "ui/views/view.h"
 
+namespace base {
+class Time;
+}
+
 namespace views {
 class Label;
 }
 
 namespace ash {
 namespace tray {
 
 // Abstract base class containing common updating and layout code for the
 // DateView popup and the TimeView tray icon. Exported for tests.
 class ASH_EXPORT BaseDateTimeView : public ActionableView {
@@ skipping 105 matching lines @@
   std::unique_ptr<views::Label> vertical_label_hours_;
   std::unique_ptr<views::Label> vertical_label_minutes_;
 
   DISALLOW_COPY_AND_ASSIGN(TimeView);
 };
 
 }  // namespace tray
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_DATE_DATE_VIEW_H_