MediaStream API: Update RTCDataChannel to match the specification

Source/modules/mediastream/RTCDataChannel.idl

Index: Source/modules/mediastream/RTCDataChannel.idl
diff --git a/Source/modules/mediastream/RTCDataChannel.idl b/Source/modules/mediastream/RTCDataChannel.idl
index 5abf290e91b38123fd2b99a820ea0eebc65a6e87..b307d37e6e81b9590022efdd238d531e11a5f48a 100644
--- a/Source/modules/mediastream/RTCDataChannel.idl
+++ b/Source/modules/mediastream/RTCDataChannel.idl
@@ -26,7 +26,17 @@
     NoInterfaceObject
 ] interface RTCDataChannel : EventTarget {
     readonly attribute DOMString label;
+
+    // DEPRECATED
     readonly attribute boolean reliable;
+
+    readonly attribute boolean ordered;
+    readonly attribute unsigned short maxRetransmitTime;
+    readonly attribute unsigned short maxRetransmits;
+    readonly attribute DOMString protocol;
+    readonly attribute boolean negotiated;
+    readonly attribute unsigned short id;
+    
     readonly attribute DOMString readyState;
     readonly attribute unsigned long bufferedAmount;