mash: Migrate SessionStateDelegate access to WmShell.

ash/shelf/shelf_locking_manager.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/shelf/shelf_locking_manager.h"
 
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/wm_shell.h"
 #include "ash/shelf/shelf.h"
 #include "ash/shell.h"
 #include "ash/wm/lock_state_controller.h"
 
 namespace ash {
 
 ShelfLockingManager::ShelfLockingManager(Shelf* shelf) : shelf_(shelf) {
   Shell* shell = Shell::GetInstance();
   shell->lock_state_controller()->AddObserver(this);
-  SessionStateDelegate* delegate = shell->session_state_delegate();
+  SessionStateDelegate* delegate = WmShell::Get()->GetSessionStateDelegate();
   session_locked_ =
       delegate->GetSessionState() != SessionStateDelegate::SESSION_STATE_ACTIVE;
   screen_locked_ = delegate->IsScreenLocked();
   delegate->AddSessionStateObserver(this);
   WmShell::Get()->AddShellObserver(this);
 }
 
 ShelfLockingManager::~ShelfLockingManager() {
-  Shell* shell = Shell::GetInstance();
-  shell->lock_state_controller()->RemoveObserver(this);
-  shell->session_state_delegate()->RemoveSessionStateObserver(this);
+  Shell::GetInstance()->lock_state_controller()->RemoveObserver(this);
+  WmShell::Get()->GetSessionStateDelegate()->RemoveSessionStateObserver(this);
   WmShell::Get()->RemoveShellObserver(this);
 }
 
 void ShelfLockingManager::OnLockStateChanged(bool locked) {
   screen_locked_ = locked;
   UpdateLockedState();
 }
 
 void ShelfLockingManager::SessionStateChanged(
     SessionStateDelegate::SessionState state) {
@@ skipping 11 matching lines @@
   const ShelfAlignment alignment = shelf_->alignment();
   if (is_locked() && alignment != SHELF_ALIGNMENT_BOTTOM_LOCKED) {
     stored_alignment_ = alignment;
     shelf_->SetAlignment(SHELF_ALIGNMENT_BOTTOM_LOCKED);
   } else if (!is_locked() && alignment == SHELF_ALIGNMENT_BOTTOM_LOCKED) {
     shelf_->SetAlignment(stored_alignment_);
   }
 }
 
 }  // namespace ash