[Refactor] Use ScopedTestPublicSessionLoginState in code

chrome/browser/extensions/api/web_request/web_request_permissions_unittest.cc

Index: chrome/browser/extensions/api/web_request/web_request_permissions_unittest.cc
diff --git a/chrome/browser/extensions/api/web_request/web_request_permissions_unittest.cc b/chrome/browser/extensions/api/web_request/web_request_permissions_unittest.cc
index f9abaf79a6d0aa979a8e719f2f11b9145b77dd3d..ed19ffdd02c48e1858303e80e33dbd5e3e612f06 100644
--- a/chrome/browser/extensions/api/web_request/web_request_permissions_unittest.cc
+++ b/chrome/browser/extensions/api/web_request/web_request_permissions_unittest.cc
@@ -9,6 +9,7 @@
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "chrome/common/extensions/extension_test_util.h"
+#include "chromeos/login/scoped_test_public_session_login_state.h"
 #include "content/public/browser/resource_request_info.h"
 #include "content/public/common/previews_state.h"
 #include "content/public/test/test_browser_thread_bundle.h"
@@ -221,11 +222,7 @@ TEST_F(ExtensionWebRequestHelpersTestWithThreadsTest,
                 false, // crosses_incognito
                 WebRequestPermissions::REQUIRE_HOST_PERMISSION));
 
-  // Set Public Session state.
-  chromeos::LoginState::Initialize();
-  chromeos::LoginState::Get()->SetLoggedInState(
-      chromeos::LoginState::LOGGED_IN_ACTIVE,
-      chromeos::LoginState::LOGGED_IN_USER_PUBLIC_ACCOUNT);
+  chromeos::ScopedTestPublicSessionLoginState login_state;
 
   // Host permission checks are disabled in Public Sessions, instead all URLs
   // are whitelisted.