Fix generics warning in FakeAdaptiveMediaPeriod.

Remove all generic arrays from this class.

FakeAdaptiveMediaPeriod.java:171: warning: [rawtypes] found raw type: ChunkSampleStream
    return new ChunkSampleStream[length];
               ^
  missing type arguments for generic class ChunkSampleStream<T>
  where T is a type-variable:
    T extends ChunkSource declared in class ChunkSampleStream

PiperOrigin-RevId: 284761750

testutils/src/main/java/com/google/android/exoplayer2/testutil/FakeAdaptiveMediaPeriod.java

@@ -45,7 +45,7 @@ public class FakeAdaptiveMediaPeriod extends FakeMediaPeriod
   private final long durationUs;
   private final long durationUs;
 
 
   private Callback callback;
   private Callback callback;
-  private ChunkSampleStream<FakeChunkSource>[] sampleStreams;
+  private List<ChunkSampleStream<FakeChunkSource>> sampleStreams;
   private SequenceableLoader sequenceableLoader;
   private SequenceableLoader sequenceableLoader;
 
 
   public FakeAdaptiveMediaPeriod(
   public FakeAdaptiveMediaPeriod(
@@ -60,7 +60,7 @@ public class FakeAdaptiveMediaPeriod extends FakeMediaPeriod
     this.chunkSourceFactory = chunkSourceFactory;
     this.chunkSourceFactory = chunkSourceFactory;
     this.transferListener = transferListener;
     this.transferListener = transferListener;
     this.durationUs = durationUs;
     this.durationUs = durationUs;
-    this.sampleStreams = newSampleStreamArray(0);
+    this.sampleStreams = new ArrayList<>();
     this.sequenceableLoader = new CompositeSequenceableLoader(new SequenceableLoader[0]);
     this.sequenceableLoader = new CompositeSequenceableLoader(new SequenceableLoader[0]);
   }
   }
 
 
@@ -94,8 +94,9 @@ public class FakeAdaptiveMediaPeriod extends FakeMediaPeriod
         validStreams.add((ChunkSampleStream<FakeChunkSource>) stream);
         validStreams.add((ChunkSampleStream<FakeChunkSource>) stream);
       }
       }
     }
     }
-    this.sampleStreams = validStreams.toArray(newSampleStreamArray(validStreams.size()));
-    this.sequenceableLoader = new CompositeSequenceableLoader(sampleStreams);
+    this.sampleStreams = validStreams;
+    this.sequenceableLoader =
+        new CompositeSequenceableLoader(sampleStreams.toArray(new SequenceableLoader[0]));
     return returnPositionUs;
     return returnPositionUs;
   }
   }
 
 
@@ -165,9 +166,4 @@ public class FakeAdaptiveMediaPeriod extends FakeMediaPeriod
   public void onContinueLoadingRequested(ChunkSampleStream<FakeChunkSource> source) {
   public void onContinueLoadingRequested(ChunkSampleStream<FakeChunkSource> source) {
     callback.onContinueLoadingRequested(this);
     callback.onContinueLoadingRequested(this);
   }
   }
-
-  @SuppressWarnings("unchecked")
-  private static ChunkSampleStream<FakeChunkSource>[] newSampleStreamArray(int length) {
-    return new ChunkSampleStream[length];
-  }
 }
 }