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

public/platform/WebRTCDataChannelInit.h

Index: public/platform/WebRTCDataChannelInit.h
diff --git a/public/webview/WebInbandTextTrackClient.h b/public/platform/WebRTCDataChannelInit.h
similarity index 78%
copy from public/webview/WebInbandTextTrackClient.h
copy to public/platform/WebRTCDataChannelInit.h
index dea4043884a7cc77ab5887582b0f0658f96a66f0..18e7f849a61238295359c9945c8d47f479c39b91 100644
--- a/public/webview/WebInbandTextTrackClient.h
+++ b/public/platform/WebRTCDataChannelInit.h
@@ -28,24 +28,30 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef WebInbandTextTrackClient_h
-#define WebInbandTextTrackClient_h
+#ifndef WebRTCDataChannelInit_h
+#define WebRTCDataChannelInit_h
 
-namespace WebKit {
+#include "WebString.h"
 
-class WebString;
+namespace WebKit {
 
-class WebInbandTextTrackClient {
+struct WebRTCDataChannelInit {
 public:
-    virtual ~WebInbandTextTrackClient() {}
+    WebRTCDataChannelInit()
+        : id(-1)
+        , ordered(true)
+        , negotiated(true)
+        , maxRetransmitTime(-1)
+        , maxRetransmits(-1) { }
 
-    virtual void addWebVTTCue(double start,
-                              double end,
-                              const WebString& id,
-                              const WebString& content,
-                              const WebString& settings) = 0;
+    int id;
+    bool ordered;
+    bool negotiated;
+    int maxRetransmitTime;
+    int maxRetransmits;

[Ami GONE FROM CHROMIUM, 2013/06/05 20:18:28]

IWBN for this to match the order in talk/app/webrtc/datachannelinterface.h
(there, maxRetransmits comes before maxRetransmitTime)

It seems natural to me to order both according to the WebIDL but maybe I'm
missing something:
http://dev.w3.org/2011/webrtc/editor/webrtc.html#idl-def-RTCDataChannelInit

+    WebString protocol;
 };
 
 } // namespace WebKit
 
-#endif
+#endif // WebRTCDataChannelInit_h