Rename ASCollectionViewLayoutControllerBeta to ASCollectionViewLayoutController

AsyncDisplayKit/ASCollectionView.mm

@@ -167,7 +167,7 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
     self.strongCollectionNode = collectionNode;
   }
   
-  _layoutController = [[ASCollectionViewLayoutControllerBeta alloc] initWithCollectionView:self];
+  _layoutController = [[ASCollectionViewLayoutController alloc] initWithCollectionView:self];
   
   _rangeController = [[ASRangeController alloc] init];
   _rangeController.dataSource = self;

AsyncDisplayKit/Details/ASCollectionViewLayoutController.h

@@ -19,7 +19,4 @@ NS_ASSUME_NONNULL_BEGIN
 
 @end
 
-@interface ASCollectionViewLayoutControllerBeta : ASCollectionViewLayoutController
-@end
-
 NS_ASSUME_NONNULL_END

AsyncDisplayKit/Details/ASCollectionViewLayoutController.mm

@@ -49,10 +49,6 @@ typedef struct ASRangeGeometry ASRangeGeometry;
   return self;
 }
 
-@end
-
-@implementation ASCollectionViewLayoutControllerBeta
-
 - (NSSet *)indexPathsForScrolling:(ASScrollDirection)scrollDirection rangeMode:(ASLayoutRangeMode)rangeMode rangeType:(ASLayoutRangeType)rangeType
 {
   ASRangeTuningParameters tuningParameters = [self tuningParametersForRangeMode:rangeMode rangeType:rangeType];