Promotes more accessors from WmShell to Shell

ash/common/system/chromeos/bluetooth/tray_bluetooth.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/chromeos/bluetooth/tray_bluetooth.h"
 
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/system/chromeos/bluetooth/tray_bluetooth_helper.h"
 #include "ash/common/system/tray/hover_highlight_view.h"
 #include "ash/common/system/tray/system_tray.h"
@@ skipping 579 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothDetailedView);
 };
 
 }  // namespace tray
 
 TrayBluetooth::TrayBluetooth(SystemTray* system_tray)
     : SystemTrayItem(system_tray, UMA_BLUETOOTH),
       default_(nullptr),
       detailed_(nullptr) {
-  WmShell::Get()->system_tray_notifier()->AddBluetoothObserver(this);
+  Shell::Get()->system_tray_notifier()->AddBluetoothObserver(this);
 }
 
 TrayBluetooth::~TrayBluetooth() {
-  WmShell::Get()->system_tray_notifier()->RemoveBluetoothObserver(this);
+  Shell::Get()->system_tray_notifier()->RemoveBluetoothObserver(this);
 }
 
 views::View* TrayBluetooth::CreateTrayView(LoginStatus status) {
   return NULL;
 }
 
 views::View* TrayBluetooth::CreateDefaultView(LoginStatus status) {
   CHECK(default_ == NULL);
   default_ = new tray::BluetoothDefaultView(this);
   default_->SetEnabled(status != LoginStatus::LOCKED);
@@ skipping 31 matching lines @@
     detailed_->Update();
 }
 
 void TrayBluetooth::OnBluetoothDiscoveringChanged() {
   if (!detailed_)
     return;
   detailed_->Update();
 }
 
 }  // namespace ash