Get rid of NULLs in core/

core/fpdfapi/fpdf_page/cpdf_textstate.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_font/include/cpdf_font.h"
 #include "core/fpdfapi/fpdf_page/cpdf_textstate.h"
 #include "core/fpdfapi/fpdf_page/pageint.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_document.h"
 
 void CPDF_TextState::SetFont(CPDF_Font* pFont) {
   CPDF_TextStateData* pStateData = GetModify();
   if (pStateData) {
     CPDF_Document* pDoc = pStateData->m_pDocument;
-    CPDF_DocPageData* pPageData = pDoc ? pDoc->GetPageData() : NULL;
+    CPDF_DocPageData* pPageData = pDoc ? pDoc->GetPageData() : nullptr;
     if (pPageData && pStateData->m_pFont && !pPageData->IsForceClear()) {
       pPageData->ReleaseFont(pStateData->m_pFont->GetFontDict());
     }
-    pStateData->m_pDocument = pFont ? pFont->m_pDocument : NULL;
+    pStateData->m_pDocument = pFont ? pFont->m_pDocument : nullptr;
     pStateData->m_pFont = pFont;
   }
 }
 
 FX_FLOAT CPDF_TextState::GetFontSizeV() const {
   FX_FLOAT* pMatrix = GetMatrix();
   FX_FLOAT unit = FXSYS_sqrt2(pMatrix[1], pMatrix[3]);
   FX_FLOAT size = unit * GetFontSize();
   return (FX_FLOAT)FXSYS_fabs(size);
 }
 
 FX_FLOAT CPDF_TextState::GetFontSizeH() const {
   FX_FLOAT* pMatrix = GetMatrix();
   FX_FLOAT unit = FXSYS_sqrt2(pMatrix[0], pMatrix[2]);
   FX_FLOAT size = unit * GetFontSize();
   return (FX_FLOAT)FXSYS_fabs(size);
 }
 
 FX_FLOAT CPDF_TextState::GetBaselineAngle() const {
   FX_FLOAT* m_Matrix = GetMatrix();
   return FXSYS_atan2(m_Matrix[2], m_Matrix[0]);
 }
 
 FX_FLOAT CPDF_TextState::GetShearAngle() const {
   FX_FLOAT* m_Matrix = GetMatrix();
   FX_FLOAT shear_angle = FXSYS_atan2(m_Matrix[1], m_Matrix[3]);
   return GetBaselineAngle() + shear_angle;
 }