Cleanup default FWL params part I

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