mash: Migrate ShellDelegate ownership and access to WmShell.

ash/accelerators/exit_warning_handler.cc

 // Copyright 2013 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/accelerators/exit_warning_handler.h"
 
+#include "ash/common/shell_delegate.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/wm_shell.h"
 #include "ash/shell.h"
-#include "ash/shell_delegate.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "grit/ash_strings.h"
 #include "ui/accessibility/ax_view_state.h"
 #include "ui/aura/window.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/font_list.h"
@@ skipping 78 matching lines @@
 
 ExitWarningHandler::ExitWarningHandler()
     : state_(IDLE), stub_timer_for_test_(false) {}
 
 ExitWarningHandler::~ExitWarningHandler() {
   // Note: If a timer is outstanding, it is stopped in its destructor.
   Hide();
 }
 
 void ExitWarningHandler::HandleAccelerator() {
-  ShellDelegate* shell_delegate = Shell::GetInstance()->delegate();
   switch (state_) {
     case IDLE:
       state_ = WAIT_FOR_DOUBLE_PRESS;
       Show();
       StartTimer();
       WmShell::Get()->RecordUserMetricsAction(UMA_ACCEL_EXIT_FIRST_Q);
       break;
     case WAIT_FOR_DOUBLE_PRESS:
       state_ = EXITING;
       CancelTimer();
       Hide();
       WmShell::Get()->RecordUserMetricsAction(UMA_ACCEL_EXIT_SECOND_Q);
-      shell_delegate->Exit();
+      WmShell::Get()->delegate()->Exit();
       break;
     case EXITING:
       break;
     default:
       NOTREACHED();
       break;
   }
 }
 
 void ExitWarningHandler::TimerAction() {
@@ skipping 41 matching lines @@
   widget_->Show();
 
   delegate->NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, true);
 }
 
 void ExitWarningHandler::Hide() {
   widget_.reset();
 }
 
 }  // namespace ash