Override NSURLRequest's private initializer so as to inherit NSURLRequest convenience initalizers

Author: ChrisChares

Foundation/NSURLRequest.swift

@@ -311,23 +311,11 @@ public class NSMutableURLRequest : NSURLRequest {
     private var _HTTPMethod: String? = "GET"
 
     public required init?(coder aDecoder: NSCoder) {
-        NSUnimplemented()
-    }
-    
-    /*!
-     @method initWithURL:
-     @abstract Initializes an NSMutableURLRequest with the given URL.
-     @discussion Default values are used for cache policy
-     (NSURLRequestUseProtocolCachePolicy) and timeout interval (60
-     seconds).
-     @param URL The URL for the request.
-     @result An initialized NSMutableURLRequest.
-     */
-    public init(URL: NSURL) {
         super.init()
-        _URL = URL
     }
 
+    private override init() { super.init() }
+    
     /*!
         @method URL
         @abstract Sets the URL of the receiver.