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

ash/common/system/chromeos/ime_menu/ime_menu_tray.cc

 // Copyright 2016 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/ime_menu/ime_menu_tray.h"
 
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/ash_constants.h"
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/system/chromeos/ime_menu/ime_list_view.h"
 #include "ash/common/system/tray/fixed_sized_scroll_view.h"
 #include "ash/common/system/tray/hover_highlight_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/system_tray_notifier.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_popup_header_button.h"
 #include "ash/common/system/tray/tray_popup_item_style.h"
 #include "ash/common/system/tray/tray_utils.h"
 #include "ash/common/wm_lookup.h"
 #include "ash/common/wm_root_window_controller.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
@@ skipping 26 matching lines @@
 // Returns the height range of ImeListView.
 gfx::Range GetImeListViewRange() {
   const int max_items = 5;
   const int min_items = 2;
   const int tray_item_height = GetTrayConstant(TRAY_POPUP_ITEM_HEIGHT);
   return gfx::Range(tray_item_height * min_items, tray_item_height * max_items);
 }
 
 // Shows language and input settings page.
 void ShowIMESettings() {
-  SystemTrayDelegate* delegate = WmShell::Get()->system_tray_delegate();
   WmShell::Get()->RecordUserMetricsAction(UMA_STATUS_AREA_IME_SHOW_DETAILED);
-  delegate->ShowIMESettings();
+  WmShell::Get()->system_tray_controller()->ShowIMESettings();
 }
 
 class ImeMenuLabel : public views::Label {
  public:
   ImeMenuLabel() {}
   ~ImeMenuLabel() override {}
 
   // views:Label:
   gfx::Size GetPreferredSize() const override {
     const int tray_constant = GetTrayConstant(TRAY_IME_MENU_ICON);
@@ skipping 454 matching lines @@
   WmShell::Get()->system_tray_delegate()->GetCurrentIME(&current_ime_);
 
   // Updates the tray label based on the current input method.
   if (current_ime_.third_party)
     label_->SetText(current_ime_.short_name + base::UTF8ToUTF16("*"));
   else
     label_->SetText(current_ime_.short_name);
 }
 
 }  // namespace ash