Remove non-cros support from ash/common/system.

ash/common/system/date/tray_date.cc

 // 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.
 
 #include "ash/common/system/date/tray_date.h"
 
 #include "ash/common/shelf/wm_shelf_util.h"
+#include "ash/common/system/chromeos/system_clock_observer.h"
 #include "ash/common/system/date/date_default_view.h"
 #include "ash/common/system/date/date_view.h"
 #include "ash/common/system/tray/system_tray.h"
 #include "ash/common/system/tray/system_tray_notifier.h"
 #include "ash/common/system/tray/tray_item_view.h"
 #include "ash/common/wm_shell.h"
 
-#if defined(OS_CHROMEOS)
-#include "ash/common/system/chromeos/system_clock_observer.h"
-#endif
-
 namespace ash {
 
 TrayDate::TrayDate(SystemTray* system_tray)
     : SystemTrayItem(system_tray, UMA_DATE),
       time_tray_(NULL),
       default_view_(NULL),
       login_status_(LoginStatus::NOT_LOGGED_IN) {
-#if defined(OS_CHROMEOS)
   system_clock_observer_.reset(new SystemClockObserver());

[James Cook, 2016/12/20 00:02:24]

nit: move into constructor initializer list

[Evan Stade, 2016/12/20 18:25:21]

Done.

-#endif
   WmShell::Get()->system_tray_notifier()->AddClockObserver(this);
 }
 
 TrayDate::~TrayDate() {
   WmShell::Get()->system_tray_notifier()->RemoveClockObserver(this);
 }
 
 views::View* TrayDate::GetHelpButtonView() const {
   if (!default_view_)
     return NULL;
@@ skipping 20 matching lines @@
           : tray::TimeView::ClockLayout::VERTICAL_CLOCK;
   time_tray_ = new tray::TimeView(clock_layout);
   views::View* view = new TrayItemView(this);
   view->AddChildView(time_tray_);
   return view;
 }
 
 views::View* TrayDate::CreateDefaultView(LoginStatus status) {
   default_view_ = new DateDefaultView(this, status);
 
-#if defined(OS_CHROMEOS)
   // Save the login status we created the view with.
   login_status_ = status;
 
   OnSystemClockCanSetTimeChanged(system_clock_observer_->can_set_time());
-#endif
   return default_view_;
 }
 
 views::View* TrayDate::CreateDetailedView(LoginStatus status) {
   return NULL;
 }
 
 void TrayDate::DestroyTrayView() {
   time_tray_ = NULL;
 }
@@ skipping 39 matching lines @@
                      : tray::DateView::DateAction::NONE);
   }
 }
 
 void TrayDate::Refresh() {
   if (time_tray_)
     time_tray_->UpdateText();
 }
 
 }  // namespace ash