Remove CFX_CountRef::IsNull in favor of operator bool

core/fxcrt/include/cfx_count_ref.h

Index: core/fxcrt/include/cfx_count_ref.h
diff --git a/core/fxcrt/include/cfx_count_ref.h b/core/fxcrt/include/cfx_count_ref.h
index cc7cf3d9ed22db13088b575a5f03900d4df4cec0..7dbd5dfe2686ba1e505146d67e148f59a891e68a 100644
--- a/core/fxcrt/include/cfx_count_ref.h
+++ b/core/fxcrt/include/cfx_count_ref.h
@@ -30,9 +30,6 @@ class CFX_CountRef {
   }
 
   void SetNull() { m_pObject.Reset(); }
-  bool IsNull() const { return !m_pObject; }
-  bool NotNull() const { return !IsNull(); }
-
   const ObjClass* GetObject() const { return m_pObject.Get(); }
 
   template <typename... Args>
@@ -48,6 +45,7 @@ class CFX_CountRef {
     return m_pObject == that.m_pObject;
   }
   bool operator!=(const CFX_CountRef& that) const { return !(*this == that); }
+  operator bool() const { return m_pObject; }
 
  protected:
   class CountedObj : public ObjClass {