[Modify] Remove it

It will never ever be used.

websocket-sharp/PayloadData.cs

@@ -40,7 +40,6 @@ namespace WebSocketSharp
     private byte[] _data;
     private long   _extDataLength;
     private long   _length;
-    private bool   _masked;
 
     #endregion
 
@@ -71,15 +70,14 @@ namespace WebSocketSharp
     }
 
     internal PayloadData (byte[] data)
-      : this (data, false)
+      : this (data, data.LongLength)
     {
     }
 
-    internal PayloadData (byte[] data, bool masked)
+    internal PayloadData (byte[] data, long length)
     {
       _data = data;
-      _masked = masked;
-      _length = data.LongLength;
+      _length = length;
     }
 
     #endregion
@@ -122,12 +120,6 @@ namespace WebSocketSharp
       }
     }
 
-    public bool IsMasked {
-      get {
-        return _masked;
-      }
-    }
-
     public ulong Length {
       get {
         return (ulong) _length;
@@ -142,8 +134,6 @@ namespace WebSocketSharp
     {
       for (long i = 0; i < _length; i++)
         _data[i] = (byte) (_data[i] ^ key[i % 4]);
-
-      _masked = !_masked;
     }
 
     #endregion

websocket-sharp/WebSocketFrame.cs

@@ -595,7 +595,7 @@ Extended Payload Length: {7}
     {
       var len = frame.FullPayloadLength;
       if (len == 0) {
-        frame._payloadData = new PayloadData (WebSocket.EmptyBytes, frame.IsMasked);
+        frame._payloadData = new PayloadData ();
         return frame;
       }
 
@@ -613,7 +613,7 @@ Extended Payload Length: {7}
         throw new WebSocketException (
           "The 'Payload Data' of a frame cannot be read from the data source.");
 
-      frame._payloadData = new PayloadData (bytes, frame.IsMasked);
+      frame._payloadData = new PayloadData (bytes);
       return frame;
     }
 
@@ -625,7 +625,7 @@ Extended Payload Length: {7}
     {
       var len = frame.FullPayloadLength;
       if (len == 0) {
-        frame._payloadData = new PayloadData (WebSocket.EmptyBytes, frame.IsMasked);
+        frame._payloadData = new PayloadData ();
         completed (frame);
 
         return;
@@ -642,7 +642,7 @@ Extended Payload Length: {7}
           throw new WebSocketException (
             "The 'Payload Data' of a frame cannot be read from the data source.");
 
-        frame._payloadData = new PayloadData (bytes, frame.IsMasked);
+        frame._payloadData = new PayloadData (bytes);
         completed (frame);
       };