Promotes more accessors from WmShell to Shell

remoting/host/disconnect_window_chromeos.cc

 // Copyright 2014 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 <string>
 
 #include "ash/common/system/tray/system_tray_notifier.h"
-#include "ash/common/wm_shell.h"
+#include "ash/shell.h"
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "remoting/host/client_session_control.h"
 #include "remoting/host/host_window.h"
 
 namespace remoting {
 
 namespace {
 
 class DisconnectWindowAura : public HostWindow {
  public:
   DisconnectWindowAura();
   ~DisconnectWindowAura() override;
 
   // HostWindow interface.
   void Start(const base::WeakPtr<ClientSessionControl>& client_session_control)
       override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DisconnectWindowAura);
 };
 
 DisconnectWindowAura::DisconnectWindowAura() {}
 
 DisconnectWindowAura::~DisconnectWindowAura() {
-  ash::WmShell::Get()->system_tray_notifier()->NotifyScreenShareStop();
+  ash::Shell::Get()->system_tray_notifier()->NotifyScreenShareStop();
 }
 
 void DisconnectWindowAura::Start(
     const base::WeakPtr<ClientSessionControl>& client_session_control) {
   // TODO(kelvinp): Clean up the NotifyScreenShareStart interface when we
   // completely retire Hangout Remote Desktop v1.
   base::string16 helper_name;
-  ash::WmShell::Get()->system_tray_notifier()->NotifyScreenShareStart(
+  ash::Shell::Get()->system_tray_notifier()->NotifyScreenShareStart(
       base::Bind(&ClientSessionControl::DisconnectSession,
                  client_session_control, protocol::OK),
       helper_name);
 }
 
 }  // namespace
 
 // static
 std::unique_ptr<HostWindow> HostWindow::CreateDisconnectWindow() {
   return base::MakeUnique<DisconnectWindowAura>();
 }
 
 }  // namespace remoting