Use enum BinaryType for WebSocket.binaryType, instead of DOMString

Source/modules/websockets/WebSocket.idl

Index: Source/modules/websockets/WebSocket.idl
diff --git a/Source/modules/websockets/WebSocket.idl b/Source/modules/websockets/WebSocket.idl
index c2a343cd22eff344cdf80919caf67e452b138cb3..c9b9d32976d67c1bb791695592ab78cf43adc1b5 100644
--- a/Source/modules/websockets/WebSocket.idl
+++ b/Source/modules/websockets/WebSocket.idl
@@ -32,7 +32,6 @@
 // http://dev.w3.org/html5/websockets/#websocket
 // http://www.whatwg.org/specs/web-apps/current-work/multipage/network.html#websocket
 
-// FIXME: use BinaryType in binaryType
 enum BinaryType { "blob", "arraybuffer" };
 
 [
@@ -67,7 +66,7 @@ enum BinaryType { "blob", "arraybuffer" };
 
     // messaging
              attribute EventHandler onmessage;
-             attribute DOMString binaryType;
+             attribute BinaryType binaryType;
     [RaisesException] void send(DOMString data);
     [RaisesException] void send(Blob data);
     [RaisesException] void send(ArrayBuffer data);