Reuse NativeThemeAuraDark for cros tray.

ash/common/system/date/date_view.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/date_view.h"
 
 #include "ash/common/system/tray/system_tray_delegate.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_utils.h"
 #include "ash/common/wm_shell.h"
@@ skipping 56 matching lines @@
   simple_formatter.format(static_cast<UDate>(time.ToDoubleT() * 1000),
                           date_string, status);
   DCHECK(U_SUCCESS(status));
   return base::string16(date_string.getBuffer(),
                         static_cast<size_t>(date_string.length()));
 }
 
 views::Label* CreateLabel() {
   views::Label* label = new views::Label;
   label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
-  label->SetBackgroundColor(SkColorSetARGB(0, 255, 255, 255));
   return label;
 }
 
 }  // namespace
 
 BaseDateTimeView::~BaseDateTimeView() {
   timer_.Stop();
 }
 
 void BaseDateTimeView::UpdateText() {
@@ skipping 240 matching lines @@
 }
 
 void TimeView::SetupLabel(views::Label* label) {
   label->set_owned_by_client();
   SetupLabelForTray(label);
   label->SetElideBehavior(gfx::NO_ELIDE);
 }
 
 }  // namespace tray
 }  // namespace ash