Move the wxWebFileProtocolHandler from the IE backend to the common source, add the RegisterProtocol method to all classes (as a stub in GTK and OSX). Register the file protocol handler in the sample for testing purposes.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/SOC2011_WEBVIEW@68446 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/webview_webkit.h

@@ -150,6 +150,9 @@ public:
     virtual void ClearSelection();
 
     virtual void RunScript(const wxString& javascript);
+    
+    //Virtual Filesystem Support
+    virtual void RegisterProtocol(wxWebProtocolHandler* hanlder);
 
     /** FIXME: hack to work around signals being received too early */
     bool m_ready;