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

ash/common/system/tray_accessibility.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_accessibility.h"
 
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/accessibility_types.h"
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/system/tray/hover_highlight_view.h"
 #include "ash/common/system/tray/system_tray.h"
+#include "ash/common/system/tray/system_tray_controller.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
 #include "ash/common/system/tray/system_tray_notifier.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_details_view.h"
 #include "ash/common/system/tray/tray_item_more.h"
 #include "ash/common/system/tray/tray_popup_item_style.h"
 #include "ash/common/system/tray/tray_popup_label_button.h"
 #include "ash/common/wm_shell.h"
 #include "ash/resources/vector_icons/vector_icons.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 294 matching lines @@
     return;
   }
   WmShell::Get()->RecordUserMetricsAction(user_action);
 }
 
 void AccessibilityDetailedView::HandleButtonPressed(views::Button* sender,
                                                     const ui::Event& event) {
   if (MaterialDesignController::UseMaterialDesignSystemIcons())
     return;
 
-  SystemTrayDelegate* tray_delegate = WmShell::Get()->system_tray_delegate();
+  SystemTrayController* controller = WmShell::Get()->system_tray_controller();
   if (sender == help_view_)
-    tray_delegate->ShowAccessibilityHelp();
+    controller->ShowAccessibilityHelp();
   else if (sender == settings_view_)
-    tray_delegate->ShowAccessibilitySettings();
+    controller->ShowAccessibilitySettings();
   else
     return;
   owner()->system_tray()->CloseSystemBubble();
 }
 
 }  // namespace tray
 
 ////////////////////////////////////////////////////////////////////////////////
 // ash::TrayAccessibility
 
@@ skipping 114 matching lines @@
     if (detailed_popup_)
       detailed_popup_->GetWidget()->Close();
     if (detailed_menu_)
       detailed_menu_->GetWidget()->Close();
   }
 
   previous_accessibility_state_ = accessibility_state;
 }
 
 }  // namespace ash