Rename IFWL classes which do not have CFWL equivalents

xfa/fwl/core/ifwl_caret.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_CORE_IFWL_CARET_H_
-#define XFA_FWL_CORE_IFWL_CARET_H_
-
-#include <memory>
-
-#include "xfa/fwl/core/cfwl_timer.h"
-#include "xfa/fwl/core/ifwl_widget.h"
-#include "xfa/fxgraphics/cfx_color.h"
-
-class CFWL_WidgetProperties;
-class IFWL_Widget;
-
-#define FWL_STATE_CAT_HightLight 1
-
-class IFWL_Caret : public IFWL_Widget {
- public:
-  IFWL_Caret(const CFWL_App* app,
-             std::unique_ptr<CFWL_WidgetProperties> properties,
-             IFWL_Widget* pOuter);
-  ~IFWL_Caret() override;
-
-  // IFWL_Widget
-  FWL_Type GetClassID() const override;
-  void DrawWidget(CFX_Graphics* pGraphics,
-                  const CFX_Matrix* pMatrix = nullptr) override;
-  void OnProcessMessage(CFWL_Message* pMessage) override;
-  void OnDrawWidget(CFX_Graphics* pGraphics,
-                    const CFX_Matrix* pMatrix) override;
-  void Update() override;
-
-  void ShowCaret(bool bFlag = true);
-
- private:
-  class Timer : public CFWL_Timer {
-   public:
-    explicit Timer(IFWL_Caret* pCaret);
-    ~Timer() override {}
-
-    void Run(CFWL_TimerInfo* hTimer) override;
-  };
-  friend class IFWL_Caret::Timer;
-
-  void DrawCaretBK(CFX_Graphics* pGraphics,
-                   IFWL_ThemeProvider* pTheme,
-                   const CFX_Matrix* pMatrix);
-
-  std::unique_ptr<IFWL_Caret::Timer> m_pTimer;
-  CFWL_TimerInfo* m_pTimerInfo;  // not owned.
-};
-
-#endif  // XFA_FWL_CORE_IFWL_CARET_H_