Split fwl/core class pt I.

xfa/fwl/core/cfwl_picturebox.h

Index: xfa/fwl/core/cfwl_picturebox.h
diff --git a/xfa/fwl/core/cfwl_picturebox.h b/xfa/fwl/core/cfwl_picturebox.h
index 12a8b632ff380ab1d75a3974060c274790538a69..9aa6817cf85dcbada247af5893b5a8656d494f30 100644
--- a/xfa/fwl/core/cfwl_picturebox.h
+++ b/xfa/fwl/core/cfwl_picturebox.h
@@ -8,9 +8,10 @@
 #define XFA_FWL_CORE_CFWL_PICTUREBOX_H_
 
 #include "xfa/fwl/core/cfwl_widget.h"
+#include "xfa/fwl/core/ifwl_dataprovider.h"
 #include "xfa/fwl/core/ifwl_picturebox.h"
 
-class CFWL_PictureBox : public CFWL_Widget, public IFWL_PictureBoxDP {
+class CFWL_PictureBox : public CFWL_Widget, public IFWL_DataProvider {
  public:
   explicit CFWL_PictureBox(const IFWL_App* pApp);
   ~CFWL_PictureBox() override;