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

xfa/fwl/basewidget/ifwl_scrollbar.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_SCROLLBAR_H_
-#define XFA_FWL_BASEWIDGET_IFWL_SCROLLBAR_H_
-
-#include "core/fxcrt/fx_system.h"
-#include "xfa/fwl/core/cfwl_widgetimpproperties.h"
-#include "xfa/fwl/core/fwl_error.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_ScrollBar L"FWL_SCROLLBAR"
-#define FWL_STYLEEXT_SCB_Horz (0L << 0)
-#define FWL_STYLEEXT_SCB_Vert (1L << 0)
-
-enum FWL_SCBCODE {
-  FWL_SCBCODE_None = 1,
-  FWL_SCBCODE_Min,
-  FWL_SCBCODE_Max,
-  FWL_SCBCODE_PageBackward,
-  FWL_SCBCODE_PageForward,
-  FWL_SCBCODE_StepBackward,
-  FWL_SCBCODE_StepForward,
-  FWL_SCBCODE_Pos,
-  FWL_SCBCODE_TrackPos,
-  FWL_SCBCODE_EndScroll,
-};
-
-class IFWL_ScrollBarDP : public IFWL_DataProvider {};
-
-class IFWL_ScrollBar : public IFWL_Widget {
- public:
-  static IFWL_ScrollBar* Create(const CFWL_WidgetImpProperties& properties,
-                                IFWL_Widget* pOuter);
-
-  FX_BOOL IsVertical();
-  FWL_Error GetRange(FX_FLOAT& fMin, FX_FLOAT& fMax);
-  FWL_Error SetRange(FX_FLOAT fMin, FX_FLOAT fMax);
-  FX_FLOAT GetPageSize();
-  FWL_Error SetPageSize(FX_FLOAT fPageSize);
-  FX_FLOAT GetStepSize();
-  FWL_Error SetStepSize(FX_FLOAT fStepSize);
-  FX_FLOAT GetPos();
-  FWL_Error SetPos(FX_FLOAT fPos);
-  FX_FLOAT GetTrackPos();
-  FWL_Error SetTrackPos(FX_FLOAT fTrackPos);
-  FX_BOOL DoScroll(uint32_t dwCode, FX_FLOAT fPos = 0.0f);
-
- protected:
-  IFWL_ScrollBar();
-};
-
-#endif  // XFA_FWL_BASEWIDGET_IFWL_SCROLLBAR_H_