Migrate frameworks/base/services/tests/servicestests to androidx.test

See go/jetpack-test-android-migration

cherrypicked from ag/4608401

Test: atest FrameworksServicesTests
Change-Id: I2d9641c681489135aa3167bb4c9b1296a1a6a4f7
diff --git a/services/tests/servicestests/src/com/android/server/am/AppErrorDialogTest.java b/services/tests/servicestests/src/com/android/server/am/AppErrorDialogTest.java
index 243c1b3..87d367f 100644
--- a/services/tests/servicestests/src/com/android/server/am/AppErrorDialogTest.java
+++ b/services/tests/servicestests/src/com/android/server/am/AppErrorDialogTest.java
@@ -18,10 +18,11 @@
 
 import android.content.Context;
 import android.os.Handler;
-import android.support.test.InstrumentationRegistry;
-import android.support.test.annotation.UiThreadTest;
-import android.support.test.filters.SmallTest;
-import android.support.test.runner.AndroidJUnit4;
+
+import androidx.test.InstrumentationRegistry;
+import androidx.test.annotation.UiThreadTest;
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
 
 import com.android.server.AppOpsService;