Remove CFX_CountRef::IsNull in favor of operator bool

core/fpdfapi/fpdf_page/cpdf_pathobject.cpp

 // Copyright 2016 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
 
 #include "core/fpdfapi/fpdf_page/include/cpdf_pathobject.h"
 
 CPDF_PathObject::CPDF_PathObject() {}
 
@@ skipping 25 matching lines @@
 
 CPDF_PathObject* CPDF_PathObject::AsPath() {
   return this;
 }
 
 const CPDF_PathObject* CPDF_PathObject::AsPath() const {
   return this;
 }
 
 void CPDF_PathObject::CalcBoundingBox() {
-  if (m_Path.IsNull()) {
+  if (!m_Path)
     return;
-  }
   CFX_FloatRect rect;
   FX_FLOAT width = m_GraphState.GetObject()->m_LineWidth;
   if (m_bStroke && width != 0) {
     rect = m_Path.GetBoundingBox(width, m_GraphState.GetObject()->m_MiterLimit);
   } else {
     rect = m_Path.GetBoundingBox();
   }
   rect.Transform(&m_Matrix);
   if (width == 0 && m_bStroke) {
     rect.left += -0.5f;
     rect.right += 0.5f;
     rect.bottom += -0.5f;
     rect.top += 0.5f;
   }
   m_Left = rect.left;
   m_Right = rect.right;
   m_Top = rect.top;
   m_Bottom = rect.bottom;
 }