[NSObject] Rename replacementObjectFor... to match the Darwin version

Author: ikesyo

Foundation/NSKeyedArchiver.swift

@@ -483,10 +483,10 @@ open class NSKeyedArchiver : NSCoder {
             return objectToEncode
         }
 
-        // object replaced by NSObject.replacementObjectForKeyedArchiver
+        // object replaced by NSObject.replacementObject(for:)
         // if it is replaced with nil, it cannot be further replaced
         if let ns = objectToEncode as? NSObject {
-            objectToEncode = ns.replacementObjectForKeyedArchiver(self)
+            objectToEncode = ns.replacementObject(for: self)
             if objectToEncode == nil {
                 replaceObject(object!, withObject: nil)
                 return nil
@@ -799,7 +799,7 @@ public protocol NSKeyedArchiverDelegate : class {
     // either returns this object or can return a different object to be encoded
     // instead.  The delegate can also fiddle with the coder state.  If the delegate
     // returns nil, nil is encoded.  This method is called after the original object
-    // may have replaced itself with replacementObjectForKeyedArchiver:.
+    // may have replaced itself with replacementObject(for:).
     // This method is not called for an object once a replacement mapping has been
     // setup for that object (either explicitly, or because the object has previously
     // been encoded).  This is also not called when nil is about to be encoded.

Foundation/NSObject.swift

@@ -260,7 +260,7 @@ open class NSObject : NSObjectProtocol, Equatable, Hashable {
     ///
     /// - Parameter aCoder: The coder encoding the instance.
     /// - Returns:          The object encode instead of the instance (if different).
-    open func replacementObjectForCoder(_ aCoder: NSCoder) -> Any? {
+    open func replacementObject(for aCoder: NSCoder) -> Any? {
         return self
     }
 
@@ -284,8 +284,8 @@ open class NSObject : NSObjectProtocol, Equatable, Hashable {
     ///
     /// - Parameter archiver:   A keyed archiver creating an archive.
     /// - Returns:              The object encode instead of the instance (if different).
-    open func replacementObjectForKeyedArchiver(_ archiver: NSKeyedArchiver) -> Any? {
-        return self.replacementObjectForCoder(archiver)
+    open func replacementObject(for archiver: NSKeyedArchiver) -> Any? {
+        return self.replacementObject(for: archiver as NSCoder)
     }
 
     /// Overridden to return the names of classes that can be used to decode