[SR-6419] Remove obsoleted NotificationCenter.addObserver(forName:object:queue:usingBlock:)

Author: ikesyo

Foundation/NSNotification.swift

@@ -188,11 +188,6 @@ open class NotificationCenter: NSObject {
         })
     }
 
-    @available(*,obsoleted:4.0,renamed:"addObserver(forName:object:queue:using:)")
-    open func addObserver(forName name: NSNotification.Name?, object obj: Any?, queue: OperationQueue?, usingBlock block: @escaping (Notification) -> Void) -> NSObjectProtocol {
-        return addObserver(forName: name, object: obj, queue: queue, using: block)
-    }
-
     open func addObserver(forName name: NSNotification.Name?, object obj: Any?, queue: OperationQueue?, using block: @escaping (Notification) -> Void) -> NSObjectProtocol {
         let object = NSObject()