Merge the CFWL_*Imp classes into the IFWL_* classes.

xfa/fwl/basewidget/ifwl_pushbutton.h

-// Copyright 2014 PDFium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
-
-#ifndef XFA_FWL_BASEWIDGET_IFWL_PUSHBUTTON_H_
-#define XFA_FWL_BASEWIDGET_IFWL_PUSHBUTTON_H_
-
-#include "xfa/fwl/core/cfwl_widgetimpproperties.h"
-#include "xfa/fwl/core/fwl_widgetimp.h"
-#include "xfa/fwl/core/ifwl_dataprovider.h"
-#include "xfa/fwl/core/ifwl_widget.h"
-
-#define FWL_CLASS_PushButton L"FWL_PUSHBUTTON"
-#define FWL_STYLEEXT_PSB_Left (0L << 0)
-#define FWL_STYLEEXT_PSB_Center (1L << 0)
-#define FWL_STYLEEXT_PSB_Right (2L << 0)
-#define FWL_STYLEEXT_PSB_Top (0L << 2)
-#define FWL_STYLEEXT_PSB_VCenter (1L << 2)
-#define FWL_STYLEEXT_PSB_Bottom (2L << 2)
-#define FWL_STYLEEXT_PSB_TextOnly (0L << 4)
-#define FWL_STYLEEXT_PSB_IconOnly (1L << 4)
-#define FWL_STYLEEXT_PSB_TextIcon (2L << 4)
-#define FWL_STYLEEXT_PSB_HLayoutMask (3L << 0)
-#define FWL_STYLEEXT_PSB_VLayoutMask (3L << 2)
-#define FWL_STYLEEXT_PSB_ModeMask (3L << 4)
-#define FWL_STATE_PSB_Hovered (1 << FWL_WGTSTATE_MAX)
-#define FWL_STATE_PSB_Pressed (1 << (FWL_WGTSTATE_MAX + 1))
-#define FWL_STATE_PSB_Default (1 << (FWL_WGTSTATE_MAX + 2))
-
-class CFX_DIBitmap;
-
-class IFWL_PushButtonDP : public IFWL_DataProvider {
- public:
-  virtual CFX_DIBitmap* GetPicture(IFWL_Widget* pWidget) = 0;
-};
-
-class IFWL_PushButton : public IFWL_Widget {
- public:
-  static IFWL_PushButton* Create(const CFWL_WidgetImpProperties& properties,
-                                 IFWL_Widget* pOuter);
-
- protected:
-  IFWL_PushButton();
-};
-
-#endif  // XFA_FWL_BASEWIDGET_IFWL_PUSHBUTTON_H_