Simplify declaration of test class

Since we only want a new name to run parameterized tests, and no new
behavior, we can alias the type rather than create a new class.

Bug: None
Test: unit_tests --gtest_filter=*AutoEnrollmentClientImplFRETo*
Change-Id: Id5c6d80a458baa2dfee382a201b5256d686da6da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341171
Auto-Submit: Yves Arrouye <drcrash@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795815}

chrome/browser/chromeos/policy/auto_enrollment_client_impl_unittest.cc

@@ -1072,8 +1072,8 @@ INSTANTIATE_TEST_SUITE_P(
     AutoEnrollmentClientImplTest,
     testing::Values(AutoEnrollmentProtocol::kInitialEnrollment));
 
-class AutoEnrollmentClientImplFREToInitialEnrollmentTest
-    : public AutoEnrollmentClientImplTest {};
+using AutoEnrollmentClientImplFREToInitialEnrollmentTest =
+    AutoEnrollmentClientImplTest;
 
 TEST_P(AutoEnrollmentClientImplFREToInitialEnrollmentTest,
        NoReEnrollmentInitialEnrollmentLicensePackaging) {