Remove unused references to NativeTheme in TrayPopupItemStyle.

ash/common/system/tray/tray_item_more.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/tray/tray_item_more.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/system/tray/system_tray_item.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_popup_item_style.h"
@@ skipping 58 matching lines @@
   icon_->SetImage(image_skia);
   SchedulePaint();
 }
 
 void TrayItemMore::SetAccessibleName(const base::string16& name) {
   accessible_name_ = name;
 }
 
 std::unique_ptr<TrayPopupItemStyle> TrayItemMore::CreateStyle() const {
   return base::MakeUnique<TrayPopupItemStyle>(
-      GetNativeTheme(), TrayPopupItemStyle::FontStyle::DEFAULT_VIEW_LABEL);
+      TrayPopupItemStyle::FontStyle::DEFAULT_VIEW_LABEL);
 }
 
 void TrayItemMore::UpdateStyle() {
   if (!MaterialDesignController::IsSystemTrayMenuMaterial())
     return;
   std::unique_ptr<TrayPopupItemStyle> style = CreateStyle();
   style->SetupLabel(label_);
 
   if (more_) {
     more_->SetImage(
@@ skipping 14 matching lines @@
   if (!accessible_name_.empty())
     node_data->SetName(accessible_name_);
 }
 
 void TrayItemMore::OnNativeThemeChanged(const ui::NativeTheme* theme) {
   ActionableView::OnNativeThemeChanged(theme);
   UpdateStyle();
 }
 
 }  // namespace ash