Remove CFX_CountRef::IsNull in favor of operator bool

core/fpdfapi/fpdf_page/cpdf_pageobject.cpp

Index: core/fpdfapi/fpdf_page/cpdf_pageobject.cpp
diff --git a/core/fpdfapi/fpdf_page/cpdf_pageobject.cpp b/core/fpdfapi/fpdf_page/cpdf_pageobject.cpp
index 31d3823891e73fd62244973142b5975aabb55fac..238675cb1c5966f2f805bb10b2a83f63029c10ce 100644
--- a/core/fpdfapi/fpdf_page/cpdf_pageobject.cpp
+++ b/core/fpdfapi/fpdf_page/cpdf_pageobject.cpp
@@ -79,17 +79,15 @@ void CPDF_PageObject::CopyData(const CPDF_PageObject* pSrc) {
 }
 
 void CPDF_PageObject::TransformClipPath(CFX_Matrix& matrix) {
-  if (m_ClipPath.IsNull()) {
+  if (!m_ClipPath)
     return;
-  }
   m_ClipPath.GetModify();
   m_ClipPath.Transform(matrix);
 }
 
 void CPDF_PageObject::TransformGeneralState(CFX_Matrix& matrix) {
-  if (m_GeneralState.IsNull()) {
+  if (!m_GeneralState)
     return;
-  }
   CPDF_GeneralStateData* pGS = m_GeneralState.GetModify();
   pGS->m_Matrix.Concat(matrix);
 }