Move fwl/lightwidget to fwl/core

xfa/fwl/lightwidget/cfwl_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_LIGHTWIDGET_CFWL_PUSHBUTTON_H_
-#define XFA_FWL_LIGHTWIDGET_CFWL_PUSHBUTTON_H_
-
-#include "xfa/fwl/core/ifwl_pushbutton.h"
-#include "xfa/fwl/lightwidget/cfwl_widget.h"
-
-class CFWL_PushButton : public CFWL_Widget {
- public:
-  CFWL_PushButton();
-  ~CFWL_PushButton() override;
-
-  IFWL_PushButton* GetWidget() override;
-  const IFWL_PushButton* GetWidget() const override;
-
-  FWL_Error Initialize(const CFWL_WidgetProperties* pProperties = nullptr);
-  FWL_Error GetCaption(CFX_WideString& wsCaption);
-  FWL_Error SetCaption(const CFX_WideStringC& wsCaption);
-  CFX_DIBitmap* GetPicture();
-  FWL_Error SetPicture(CFX_DIBitmap* pBitmap);
-
- protected:
-  class CFWL_PushButtonDP : public IFWL_PushButtonDP {
-   public:
-    CFWL_PushButtonDP() : m_pBitmap(nullptr) {}
-
-    // IFWL_DataProvider
-    FWL_Error GetCaption(IFWL_Widget* pWidget,
-                         CFX_WideString& wsCaption) override;
-
-    // IFWL_PushButtonDP
-    CFX_DIBitmap* GetPicture(IFWL_Widget* pWidget) override;
-
-    CFX_WideString m_wsCaption;
-    CFX_DIBitmap* m_pBitmap;
-  };
-
-  CFWL_PushButtonDP m_buttonData;
-};
-
-#endif  // XFA_FWL_LIGHTWIDGET_CFWL_PUSHBUTTON_H_