Use mojo SystemTray interfaces for both mash and classic ash

ash/test/test_shell_delegate.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/test/test_shell_delegate.h"
 
 #include <limits>
 
 #include "ash/app_list/app_list_presenter_delegate.h"
 #include "ash/app_list/app_list_presenter_delegate_factory.h"
@@ skipping 94 matching lines @@
 
 TestShellDelegate::TestShellDelegate()
     : num_exit_requests_(0),
       multi_profiles_enabled_(false),
       force_maximize_on_first_run_(false),
       app_list_presenter_delegate_factory_(new AppListPresenterDelegateFactory(
           base::WrapUnique(new AppListViewDelegateFactoryImpl))) {}
 
 TestShellDelegate::~TestShellDelegate() {}
 
+::shell::Connector* TestShellDelegate::GetShellConnector() const {
+  return nullptr;
+}
+
 bool TestShellDelegate::IsFirstRunAfterBoot() const {
   return false;
 }
 
 bool TestShellDelegate::IsIncognitoAllowed() const {
   return true;
 }
 
 bool TestShellDelegate::IsMultiProfilesEnabled() const {
   return multi_profiles_enabled_;
@@ skipping 87 matching lines @@
 void TestShellDelegate::SetMediaCaptureState(MediaCaptureState state) {
 #if defined(OS_CHROMEOS)
   static_cast<MediaDelegateImpl*>(WmShell::Get()->media_delegate())
       ->set_media_capture_state(state);
   WmShell::Get()->system_tray_notifier()->NotifyMediaCaptureChanged();
 #endif
 }
 
 }  // namespace test
 }  // namespace ash