[Refactor] Use ScopedTestPublicSessionLoginState in code

chrome/browser/chromeos/extensions/permissions_updater_delegate_chromeos_unittest.cc

 // Copyright 2017 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/chromeos/extensions/permissions_updater_delegate_chromeos.h"
 
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/memory/ptr_util.h"
 #include "base/values.h"
 #include "chromeos/login/login_state.h"
+#include "chromeos/login/scoped_test_public_session_login_state.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/manifest.h"
 #include "extensions/common/manifest_constants.h"
 #include "extensions/common/permissions/api_permission.h"
 #include "extensions/common/permissions/api_permission_set.h"
 #include "extensions/common/permissions/manifest_permission_set.h"
 #include "extensions/common/permissions/mock_manifest_permission.h"
 #include "extensions/common/permissions/permission_set.h"
 #include "extensions/common/url_pattern.h"
 #include "extensions/common/url_pattern_set.h"
@@ skipping 55 matching lines @@
 
   // Bogus extension ID (never whitelisted) outside PS, nothing filtered.
   extension = CreateExtension(kBogusId);
   granted_permissions = CreatePermissions();
   delegate.InitializePermissions(extension.get(), &granted_permissions);
   EXPECT_EQ(*CreatePermissions(), *granted_permissions);
 }
 
 TEST(PermissionsUpdaterDelegateChromeOSTest,
      FilterNonWhitelistedInsidePublicSession) {
+  chromeos::ScopedTestPublicSessionLoginState login_state;
   PermissionsUpdaterDelegateChromeOS delegate;
-  // Set Public Session state.
-  chromeos::LoginState::Initialize();
-  chromeos::LoginState::Get()->SetLoggedInState(
-    chromeos::LoginState::LOGGED_IN_ACTIVE,
-    chromeos::LoginState::LOGGED_IN_USER_PUBLIC_ACCOUNT);
 
   // Whitelisted extension, nothing gets filtered.
   auto extension = CreateExtension(kWhitelistedId);
   auto granted_permissions = CreatePermissions();
   delegate.InitializePermissions(extension.get(), &granted_permissions);
   EXPECT_EQ(*CreatePermissions(), *granted_permissions);
 
   // Bogus extension ID (never whitelisted), ClipboardRead filtered out,
   // everything else stays.
   extension = CreateExtension(kBogusId);
   granted_permissions = CreatePermissions();
   delegate.InitializePermissions(extension.get(), &granted_permissions);
   EXPECT_EQ(*CreatePermissions(false), *granted_permissions);
-
-  // Reset state at the end of test.
-  chromeos::LoginState::Shutdown();
 }
 
 }  // namespace extensions