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

ash/common/system/chromeos/palette/palette_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/palette/palette_tray.h"
 
 #include "ash/common/shelf/shelf_constants.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/system/chromeos/palette/palette_tool_manager.h"
 #include "ash/common/system/chromeos/palette/palette_utils.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_bubble_wrapper.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_popup_header_button.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"
 #include "ash/resources/vector_icons/vector_icons.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 94 matching lines @@
   }
 
   ~TitleView() override {}
 
  private:
   // views::ButtonListener:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override {
     if (sender == settings_button_) {
       palette_tray_->RecordPaletteOptionsUsage(
           PaletteTrayOptions::PALETTE_SETTINGS_BUTTON);
-      WmShell::Get()->system_tray_delegate()->ShowPaletteSettings();
+      WmShell::Get()->system_tray_controller()->ShowPaletteSettings();
       palette_tray_->HidePalette();
     } else if (sender == help_button_) {
       palette_tray_->RecordPaletteOptionsUsage(
           PaletteTrayOptions::PALETTE_HELP_BUTTON);
-      WmShell::Get()->system_tray_delegate()->ShowPaletteHelp();
+      WmShell::Get()->system_tray_controller()->ShowPaletteHelp();
       palette_tray_->HidePalette();
     } else {
       NOTREACHED();
     }
   }
 
   // Unowned pointers to button views so we can determine which button was
   // clicked.
   ash::TrayPopupHeaderButton* settings_button_;
   ash::TrayPopupHeaderButton* help_button_;
@@ skipping 295 matching lines @@
   } else {
     UpdateIconVisibility();
   }
 }
 
 void PaletteTray::UpdateIconVisibility() {
   SetVisible(IsInUserSession());
 }
 
 }  // namespace ash