Removes the old createDataChannel and starts to use the new one with WebRTCDataChannelInit

public/platform/WebRTCPeerConnectionHandler.h

Index: public/platform/WebRTCPeerConnectionHandler.h
diff --git a/public/platform/WebRTCPeerConnectionHandler.h b/public/platform/WebRTCPeerConnectionHandler.h
index fb2fc6f46faf29972fddd90d156dc1c8d532301f..7d9310e9d80b04f316b80cacb331acbd5c21ca9c 100644
--- a/public/platform/WebRTCPeerConnectionHandler.h
+++ b/public/platform/WebRTCPeerConnectionHandler.h
@@ -31,9 +31,6 @@
 #ifndef WebRTCPeerConnectionHandler_h
 #define WebRTCPeerConnectionHandler_h
 
-#include "WebCommon.h"
-#include "WebString.h"
-
 namespace WebKit {
 class WebMediaConstraints;
 class WebMediaStream;
@@ -47,15 +44,8 @@ class WebRTCSessionDescription;
 class WebRTCSessionDescriptionRequest;
 class WebRTCStatsRequest;
 class WebRTCVoidRequest;
-
-struct WebRTCDataChannelInit {
-    unsigned short id;
-    bool ordered;
-    bool negotiated;
-    int maxRetransmitTime;
-    int maxRetransmits;
-    WebString protocol;
-};
+class WebString;
+struct WebRTCDataChannelInit;
 
 class WebRTCPeerConnectionHandler {
 public:
@@ -74,12 +64,7 @@ public:
     virtual bool addStream(const WebMediaStream&, const WebMediaConstraints&) = 0;
     virtual void removeStream(const WebMediaStream&) = 0;
     virtual void getStats(const WebRTCStatsRequest&) = 0;
-    virtual WebRTCDataChannelHandler* createDataChannel(const WebString& label, bool reliable) = 0;
-    virtual WebRTCDataChannelHandler* createDataChannel(const WebString& label, const WebRTCDataChannelInit& init)
-    {
-        WEBKIT_ASSERT_NOT_REACHED();
-        return 0;
-    }
+    virtual WebRTCDataChannelHandler* createDataChannel(const WebString& label, const WebRTCDataChannelInit&) = 0;
     virtual WebRTCDTMFSenderHandler* createDTMFSender(const WebMediaStreamTrack&) = 0;
     virtual void stop() = 0;
 };