chromeos: Refactor system tray "show settings" commands to use mojo

ash/common/system/chromeos/settings/tray_settings.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/chromeos/settings/tray_settings.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/system/chromeos/power/power_status.h"
 #include "ash/common/system/chromeos/power/power_status_view.h"
 #include "ash/common/system/tray/actionable_view.h"
 #include "ash/common/system/tray/fixed_sized_image_view.h"
+#include "ash/common/system/tray/system_tray_controller.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/wm_shell.h"
 #include "ash/resources/vector_icons/vector_icons.h"
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 #include "grit/ash_resources.h"
 #include "grit/ash_strings.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/base/resource/resource_bundle.h"
@@ skipping 58 matching lines @@
   ~SettingsDefaultView() override { PowerStatus::Get()->RemoveObserver(this); }
 
   // Overridden from ash::ActionableView.
   bool PerformAction(const ui::Event& event) override {
     if (login_status_ == LoginStatus::NOT_LOGGED_IN ||
         login_status_ == LoginStatus::LOCKED ||
         WmShell::Get()->GetSessionStateDelegate()->IsInSecondaryLoginScreen()) {
       return false;
     }
 
-    WmShell::Get()->system_tray_delegate()->ShowSettings();
+    WmShell::Get()->system_tray_controller()->ShowSettings();
     CloseSystemBubble();
     return true;
   }
 
   // Overridden from views::View.
   void Layout() override {
     views::View::Layout();
 
     if (label_ && power_status_view_) {
       // Let the box-layout do the layout first. Then move power_status_view_
@@ skipping 64 matching lines @@
 
 void TraySettings::DestroyDefaultView() {
   default_view_ = nullptr;
 }
 
 void TraySettings::DestroyDetailedView() {}
 
 void TraySettings::UpdateAfterLoginStatusChange(LoginStatus status) {}
 
 }  // namespace ash