Respond to CR.

Signal/src/ViewControllers/ConversationView/ConversationViewLayout.m

@@ -172,26 +172,6 @@ NS_ASSUME_NONNULL_BEGIN
     return self.collectionView.bounds.size.width != newBounds.size.width;
 }
 
-- (nullable UICollectionViewLayoutAttributes *)initialLayoutAttributesForAppearingItemAtIndexPath:
-    (NSIndexPath *)indexPath
-{
-    UICollectionViewLayoutAttributes *_Nullable layoutAttributes =
-        [super initialLayoutAttributesForAppearingItemAtIndexPath:indexPath];
-    // Don't fade in new cells.
-    layoutAttributes.alpha = 1.f;
-    return layoutAttributes;
-}
-
-- (nullable UICollectionViewLayoutAttributes *)finalLayoutAttributesForDisappearingItemAtIndexPath:
-    (NSIndexPath *)indexPath
-{
-    UICollectionViewLayoutAttributes *_Nullable layoutAttributes =
-        [super finalLayoutAttributesForDisappearingItemAtIndexPath:indexPath];
-    // Don't fade in new cells.
-    layoutAttributes.alpha = 1.f;
-    return layoutAttributes;
-}
-
 @end
 
 NS_ASSUME_NONNULL_END