MediaStream API: Update RTCDataChannel to match the specification

Source/modules/mediastream/RTCDataChannel.cpp

Index: Source/modules/mediastream/RTCDataChannel.cpp
diff --git a/Source/modules/mediastream/RTCDataChannel.cpp b/Source/modules/mediastream/RTCDataChannel.cpp
index 9f3c7b94df46da8d90853ace37609215dac9bdb0..d90f8e76a44b60f52566acf4e4449d83c50c19bb 100644
--- a/Source/modules/mediastream/RTCDataChannel.cpp
+++ b/Source/modules/mediastream/RTCDataChannel.cpp
@@ -80,6 +80,36 @@ bool RTCDataChannel::reliable() const
     return m_handler->isReliable();
 }
 
+bool RTCDataChannel::ordered() const
+{
+    return m_handler->ordered();
+}
+
+unsigned short RTCDataChannel::maxRetransmitTime() const
+{
+    return m_handler->maxRetransmitTime();
+}
+
+unsigned short RTCDataChannel::maxRetransmits() const
+{
+    return m_handler->maxRetransmits();
+}
+
+String RTCDataChannel::protocol() const
+{
+    return m_handler->protocol();
+}
+
+bool RTCDataChannel::negotiated() const
+{
+    return m_handler->negotiated();
+}
+
+unsigned short RTCDataChannel::id() const
+{
+    return m_handler->id();
+}
+
 String RTCDataChannel::readyState() const
 {
     switch (m_readyState) {