Remove unnecessary custom shadow annotations. (#5388)

Author: gsakakihara

firebase-messaging/src/test/java/com/google/firebase/messaging/FirebaseMessagingServiceRoboTest.java

@@ -60,7 +60,6 @@
 import com.google.firebase.FirebaseOptions;
 import com.google.firebase.iid.FirebaseInstanceIdReceiver;
 import com.google.firebase.messaging.AnalyticsTestHelper.Analytics;
-import com.google.firebase.messaging.shadows.ShadowMessenger;
 import com.google.firebase.messaging.testing.AnalyticsValidator;
 import com.google.firebase.messaging.testing.Bundles;
 import com.google.firebase.messaging.testing.FakeConnectorComponent;
@@ -81,13 +80,11 @@
 import org.robolectric.Robolectric;
 import org.robolectric.RobolectricTestRunner;
 import org.robolectric.android.controller.ServiceController;
-import org.robolectric.annotation.Config;
 import org.robolectric.annotation.LooperMode;
 import org.robolectric.annotation.LooperMode.Mode;
 import org.robolectric.shadows.ShadowLooper;
 
 @RunWith(RobolectricTestRunner.class)
-@Config(shadows = {ShadowMessenger.class})
 @LooperMode(Mode.PAUSED)
 public class FirebaseMessagingServiceRoboTest {
 

firebase-messaging/src/test/java/com/google/firebase/messaging/TopicsStoreRoboTest.java

@@ -21,18 +21,15 @@
 import android.content.Context;
 import android.content.SharedPreferences;
 import androidx.test.core.app.ApplicationProvider;
-import com.google.firebase.messaging.shadows.ShadowPreconditions;
 import com.google.firebase.messaging.testing.FakeScheduledExecutorService;
 import java.util.Arrays;
 import java.util.List;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.robolectric.RobolectricTestRunner;
-import org.robolectric.annotation.Config;
 
 @RunWith(RobolectricTestRunner.class)
-@Config(shadows = ShadowPreconditions.class)
 public class TopicsStoreRoboTest {
 
   private TopicsStore store;