Fix download cancellation

Issue: #4403

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=201525284

RELEASENOTES.md

@@ -38,6 +38,8 @@
   CommentFrame to InternalFrame for frames with gapless metadata in MP4.
 * Allow setting the `Looper`, which is used to access the player, in
   `ExoPlayerFactory` ([#4278](https://github.com/google/ExoPlayer/issues/4278)).
+* Fix a bug where download cancellation was ignored
+  ([#4403](https://github.com/google/ExoPlayer/issues/4403)).
 
 ### 2.8.2 ###
 

library/core/src/main/java/com/google/android/exoplayer2/upstream/cache/CacheUtil.java

@@ -138,11 +138,11 @@ public final class CacheUtil {
         cache,
         new CacheDataSource(cache, upstream),
         new byte[DEFAULT_BUFFER_SIZE_BYTES],
-        null,
-        0,
+        /* priorityTaskManager= */ null,
+        /* priority= */ 0,
         counters,
-        null,
-        false);
+        isCanceled,
+        /* enableEOFException= */ false);
   }
 
   /**