Remove unused references to NativeTheme in TrayPopupItemStyle.

ash/common/system/chromeos/screen_security/screen_tray_item.cc

 // Copyright 2013 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/chromeos/screen_security/screen_tray_item.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/system/tray/fixed_sized_image_view.h"
 #include "ash/common/system/tray/tray_constants.h"
@@ skipping 83 matching lines @@
     icon_->SetImage(bundle.GetImageNamed(IDR_AURA_UBER_TRAY_SCREENSHARE_DARK)
                         .ToImageSkia());
   }
 
   label_ = TrayPopupUtils::CreateDefaultLabel();
   label_->SetMultiLine(true);
   label_->SetText(label_text_);
   // TODO(bruthig): Multiline Labels don't lay out well with borders.
   // See https://crbug.com/678337 & https://crbug.com/682221.
   label_->SetBorder(nullptr);
+  TrayPopupItemStyle style(TrayPopupItemStyle::FontStyle::DEFAULT_VIEW_LABEL);
+  style.SetupLabel(label_);
 
   stop_button_ = TrayPopupUtils::CreateTrayPopupButton(this, stop_button_text_);
 }
 
 void ScreenStatusView::UpdateFromScreenTrayItem() {
   // Hide the notification bubble when the ash tray bubble opens.
   screen_tray_item_->HideNotificationView();
   SetVisible(screen_tray_item_->is_started());
 }
 
-void ScreenStatusView::OnNativeThemeChanged(const ui::NativeTheme* theme) {
-  if (!MaterialDesignController::IsSystemTrayMenuMaterial()) {
-    views::View::OnNativeThemeChanged(theme);
-    return;
-  }
-
-  if (theme) {
-    TrayPopupItemStyle style(theme,
-                             TrayPopupItemStyle::FontStyle::DEFAULT_VIEW_LABEL);
-    style.SetupLabel(label_);
-  }
-}
-
 ScreenNotificationDelegate::ScreenNotificationDelegate(
     ScreenTrayItem* screen_tray)
     : screen_tray_(screen_tray) {}
 
 ScreenNotificationDelegate::~ScreenNotificationDelegate() {}
 
 void ScreenNotificationDelegate::ButtonClick(int button_index) {
   DCHECK_EQ(0, button_index);
   screen_tray_->Stop();
   screen_tray_->RecordStoppedFromNotificationViewMetric();
@@ skipping 62 matching lines @@
 
 void ScreenTrayItem::DestroyTrayView() {
   tray_view_ = nullptr;
 }
 
 void ScreenTrayItem::DestroyDefaultView() {
   default_view_ = nullptr;
 }
 
 }  // namespace ash