Support SystemTrayDelegate::ShowPowerSettings() in mustash

ash/mus/system_tray_delegate_mus.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/mus/system_tray_delegate_mus.h"
 
 #include "ash/common/system/tray/system_tray_notifier.h"
 #include "ash/common/wm_shell.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 61 matching lines @@
     const std::string& guid) {
   // http://crbug.com/647412
   NOTIMPLEMENTED();
 }
 
 void SystemTrayDelegateMus::ShowDisplaySettings() {
   ConnectToSystemTrayClient()->ShowDisplaySettings();
 }
 
 void SystemTrayDelegateMus::ShowPowerSettings() {
-  // http://crbug.com/647412
-  NOTIMPLEMENTED();
+  ConnectToSystemTrayClient()->ShowPowerSettings();
 }
 
 void SystemTrayDelegateMus::ShowChromeSlow() {
   ConnectToSystemTrayClient()->ShowChromeSlow();
 }
 
 void SystemTrayDelegateMus::ShowIMESettings() {
   ConnectToSystemTrayClient()->ShowIMESettings();
 }
 
@@ skipping 32 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // mojom::SystemTray:
 
 void SystemTrayDelegateMus::SetUse24HourClock(bool use_24_hour) {
   hour_clock_type_ = use_24_hour ? base::k24HourClock : base::k12HourClock;
   WmShell::Get()->system_tray_notifier()->NotifyDateFormatChanged();
 }
 
 }  // namespace ash