Switch ASScrollNode to block initialiser syntax.

AsyncDisplayKit/ASScrollNode.m

@@ -0,0 +1,20 @@
+/* Copyright (c) 2014-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+#import "ASScrollNode.h"
+
+@implementation ASScrollNode
+
+- (instancetype)init
+{
+  return [super initWithViewBlock:^UIView *{
+    return [[UIScrollView alloc] init];
+  }];
+}
+
+@end