Split fwl/core class pt I.

xfa/fwl/core/cfwl_pushbutton.h

Index: xfa/fwl/core/cfwl_pushbutton.h
diff --git a/xfa/fwl/core/cfwl_pushbutton.h b/xfa/fwl/core/cfwl_pushbutton.h
index ad17406d12d59e33566c63485e086ca085e90e94..7bc8f856279d146b938761ddb408113c921d8b23 100644
--- a/xfa/fwl/core/cfwl_pushbutton.h
+++ b/xfa/fwl/core/cfwl_pushbutton.h
@@ -8,9 +8,10 @@
 #define XFA_FWL_CORE_CFWL_PUSHBUTTON_H_
 
 #include "xfa/fwl/core/cfwl_widget.h"
+#include "xfa/fwl/core/ifwl_dataprovider.h"
 #include "xfa/fwl/core/ifwl_pushbutton.h"
 
-class CFWL_PushButton : public CFWL_Widget, public IFWL_PushButtonDP {
+class CFWL_PushButton : public CFWL_Widget, public IFWL_DataProvider {
  public:
   explicit CFWL_PushButton(const IFWL_App*);
   ~CFWL_PushButton() override;