mash: Migrate SessionStateDelegate access to WmShell.

chrome/browser/ui/ash/chrome_shell_content_state_chromeos.cc

 // Copyright 2015 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 "chrome/browser/ui/ash/chrome_shell_content_state.h"
 
 #include "ash/common/session/session_state_delegate.h"
-#include "ash/shell.h"
+#include "ash/common/wm_shell.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/ui/ash/multi_user/multi_user_util.h"
 #include "chrome/browser/ui/ash/multi_user/multi_user_window_manager.h"
 #include "components/signin/core/account_id/account_id.h"
 #include "components/user_manager/user_manager.h"
 #include "content/public/browser/browser_context.h"
 
 content::BrowserContext* ChromeShellContentState::GetBrowserContextByIndex(
     ash::UserIndex index) {
   ash::SessionStateDelegate* session_state_delegate =
-      ash::Shell::GetInstance()->session_state_delegate();
+      ash::WmShell::Get()->GetSessionStateDelegate();
   DCHECK_LT(index, session_state_delegate->NumberOfLoggedInUsers());
   user_manager::User* user =
       user_manager::UserManager::Get()->GetLRULoggedInUsers()[index];
   CHECK(user);
   return chromeos::ProfileHelper::Get()->GetProfileByUser(user);
 }
 
 content::BrowserContext* ChromeShellContentState::GetBrowserContextForWindow(
     aura::Window* window) {
   const AccountId& account_id =
       chrome::MultiUserWindowManager::GetInstance()->GetWindowOwner(window);
   return account_id.is_valid()
              ? multi_user_util::GetProfileFromAccountId(account_id)
              : nullptr;
 }
 
 content::BrowserContext*
 ChromeShellContentState::GetUserPresentingBrowserContextForWindow(
     aura::Window* window) {
   const AccountId& account_id =
       chrome::MultiUserWindowManager::GetInstance()->GetUserPresentingWindow(
           window);
   return account_id.is_valid()
              ? multi_user_util::GetProfileFromAccountId(account_id)
              : nullptr;
 }