Remove dead code in ProgressiveMediaSource.Builder

These fields cannot be set and the logic to handle them can be removed.

PiperOrigin-RevId: 544646460
(cherry picked from commit d5ba034e1f7435c55f52126be53a09a7f3bc37a9)

library/core/src/main/java/com/google/android/exoplayer2/source/ProgressiveMediaSource.java

@@ -66,8 +66,6 @@ public final class ProgressiveMediaSource extends BaseMediaSource
     private DrmSessionManagerProvider drmSessionManagerProvider;
     private LoadErrorHandlingPolicy loadErrorHandlingPolicy;
     private int continueLoadingCheckIntervalBytes;
-    @Nullable private String customCacheKey;
-    @Nullable private Object tag;
 
     /**
      * Creates a new factory for {@link ProgressiveMediaSource}s.
@@ -211,16 +209,6 @@ public final class ProgressiveMediaSource extends BaseMediaSource
     @Override
     public ProgressiveMediaSource createMediaSource(MediaItem mediaItem) {
       checkNotNull(mediaItem.localConfiguration);
-      boolean needsTag = mediaItem.localConfiguration.tag == null && tag != null;
-      boolean needsCustomCacheKey =
-          mediaItem.localConfiguration.customCacheKey == null && customCacheKey != null;
-      if (needsTag && needsCustomCacheKey) {
-        mediaItem = mediaItem.buildUpon().setTag(tag).setCustomCacheKey(customCacheKey).build();
-      } else if (needsTag) {
-        mediaItem = mediaItem.buildUpon().setTag(tag).build();
-      } else if (needsCustomCacheKey) {
-        mediaItem = mediaItem.buildUpon().setCustomCacheKey(customCacheKey).build();
-      }
       return new ProgressiveMediaSource(
           mediaItem,
           dataSourceFactory,