Switch the demo app from Util.areEqual to Guava's Objects.equals

Util.areEqual will not be part of the stable API.

PiperOrigin-RevId: 437723080

demos/main/src/main/java/androidx/media3/demo/main/SampleChooserActivity.java

@@ -54,6 +54,7 @@ import androidx.media3.datasource.DataSourceUtil;
 import androidx.media3.datasource.DataSpec;
 import androidx.media3.exoplayer.RenderersFactory;
 import androidx.media3.exoplayer.offline.DownloadService;
+import com.google.common.base.Objects;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import java.io.IOException;
@@ -487,7 +488,7 @@ public class SampleChooserActivity extends AppCompatActivity
 
     private PlaylistGroup getGroup(String groupName, List<PlaylistGroup> groups) {
       for (int i = 0; i < groups.size(); i++) {
-        if (Util.areEqual(groupName, groups.get(i).title)) {
+        if (Objects.equal(groupName, groups.get(i).title)) {
           return groups.get(i);
         }
       }