Fix ChunkSource disable definition.

library/src/main/java/com/google/android/exoplayer/chunk/ChunkSource.java

@@ -58,7 +58,7 @@ public interface ChunkSource {
    *
    * @param queue A representation of the currently buffered {@link MediaChunk}s.
    */
-  void disable(List<MediaChunk> queue);
+  void disable(List<? extends MediaChunk> queue);
 
   /**
    * Indicates to the source that it should still be checking for updates to the stream.

library/src/main/java/com/google/android/exoplayer/chunk/MultiTrackChunkSource.java

@@ -68,7 +68,7 @@ public class MultiTrackChunkSource implements ChunkSource, ExoPlayerComponent {
   }
 
   @Override
-  public void disable(List<MediaChunk> queue) {
+  public void disable(List<? extends MediaChunk> queue) {
     selectedSource.disable(queue);
     enabled = false;
   }

library/src/main/java/com/google/android/exoplayer/dash/DashMp4ChunkSource.java

@@ -129,7 +129,7 @@ public class DashMp4ChunkSource implements ChunkSource {
   }
 
   @Override
-  public void disable(List<MediaChunk> queue) {
+  public void disable(List<? extends MediaChunk> queue) {
     evaluator.disable();
   }
 

library/src/main/java/com/google/android/exoplayer/dash/DashWebmChunkSource.java

@@ -110,7 +110,7 @@ public class DashWebmChunkSource implements ChunkSource {
   }
 
   @Override
-  public void disable(List<MediaChunk> queue) {
+  public void disable(List<? extends MediaChunk> queue) {
      evaluator.disable();
   }
 

library/src/main/java/com/google/android/exoplayer/smoothstreaming/SmoothStreamingChunkSource.java

@@ -141,7 +141,7 @@ public class SmoothStreamingChunkSource implements ChunkSource {
   }
 
   @Override
-  public void disable(List<MediaChunk> queue) {
+  public void disable(List<? extends MediaChunk> queue) {
     // Do nothing.
   }