Remove unnecessary use of Robolectric LEGACY looper mode

CacheDataSourceTest2 works fine in PAUSED mode as well.

PiperOrigin-RevId: 322150471

library/core/src/test/java/com/google/android/exoplayer2/upstream/cache/CacheDataSourceTest2.java

@@ -18,7 +18,6 @@ package com.google.android.exoplayer2.upstream.cache;
 import static com.google.common.truth.Truth.assertThat;
 import static com.google.common.truth.Truth.assertThat;
 import static java.util.Arrays.copyOf;
 import static java.util.Arrays.copyOf;
 import static java.util.Arrays.copyOfRange;
 import static java.util.Arrays.copyOfRange;
-import static org.robolectric.annotation.LooperMode.Mode.LEGACY;
 
 
 import android.content.Context;
 import android.content.Context;
 import android.net.Uri;
 import android.net.Uri;
@@ -40,10 +39,8 @@ import java.io.IOException;
 import java.util.Random;
 import java.util.Random;
 import org.junit.Test;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runner.RunWith;
-import org.robolectric.annotation.LooperMode;
 
 
 /** Additional tests for {@link CacheDataSource}. */
 /** Additional tests for {@link CacheDataSource}. */
-@LooperMode(LEGACY)
 @RunWith(AndroidJUnit4.class)
 @RunWith(AndroidJUnit4.class)
 public final class CacheDataSourceTest2 {
 public final class CacheDataSourceTest2 {