Try not adapting before failing with BehindLiveWindowException in Hls

Issue:#1782

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=136025847

library/src/main/java/com/google/android/exoplayer2/source/hls/HlsChunkSource.java

@@ -257,10 +257,18 @@ import java.util.Locale;
         chunkMediaSequence = getLiveNextChunkSequenceNumber(previous.chunkIndex, oldVariantIndex,
         chunkMediaSequence = getLiveNextChunkSequenceNumber(previous.chunkIndex, oldVariantIndex,
             newVariantIndex);
             newVariantIndex);
         if (chunkMediaSequence < mediaPlaylist.mediaSequence) {
         if (chunkMediaSequence < mediaPlaylist.mediaSequence) {
+          // We try getting the next chunk without adapting in case that's the reason for falling
+          // behind the live window.
+          newVariantIndex = oldVariantIndex;
+          mediaPlaylist = variantPlaylists[newVariantIndex];
+          chunkMediaSequence = getLiveNextChunkSequenceNumber(previous.chunkIndex, oldVariantIndex,
+              newVariantIndex);
+          if (chunkMediaSequence < mediaPlaylist.mediaSequence) {
             fatalError = new BehindLiveWindowException();
             fatalError = new BehindLiveWindowException();
             return;
             return;
           }
           }
         }
         }
+      }
     } else {
     } else {
       // Not live.
       // Not live.
       if (previous == null) {
       if (previous == null) {