Get rid of NULLs in core/

core/fpdfdoc/pdf_vt.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 CORE_FPDFDOC_PDF_VT_H_
 #define CORE_FPDFDOC_PDF_VT_H_
 
 #include "core/fpdfdoc/cpvt_floatrect.h"
@@ skipping 10 matching lines @@
 #define IsFloatEqual(fa, fb) IsFloatZero((fa) - (fb))
 
 template <class TYPE>
 class CPVT_ArrayTemplate : public CFX_ArrayTemplate<TYPE> {
  public:
   FX_BOOL IsEmpty() { return CFX_ArrayTemplate<TYPE>::GetSize() <= 0; }
   TYPE GetAt(int nIndex) const {
     if (nIndex >= 0 && nIndex < CFX_ArrayTemplate<TYPE>::GetSize()) {
       return CFX_ArrayTemplate<TYPE>::GetAt(nIndex);
     }
-    return NULL;
+    return nullptr;
   }
   void RemoveAt(int nIndex) {
     if (nIndex >= 0 && nIndex < CFX_ArrayTemplate<TYPE>::GetSize()) {
       CFX_ArrayTemplate<TYPE>::RemoveAt(nIndex);
     }
   }
 };
 class CLine final {
  public:
   CLine();
@@ skipping 86 matching lines @@
     return CPVT_FloatRect(ptLeftTop.x, ptLeftTop.y, ptRightBottom.x,
                           ptRightBottom.y);
   }
 
  private:
   CFX_FloatRect m_rcPlate;
   CPVT_FloatRect m_rcContent;
 };
 
 #endif  // CORE_FPDFDOC_PDF_VT_H_