Get rid of NULLs in core/

core/fpdfapi/fpdf_edit/cpdf_pagecontentgenerator.cpp

Index: core/fpdfapi/fpdf_edit/cpdf_pagecontentgenerator.cpp
diff --git a/core/fpdfapi/fpdf_edit/cpdf_pagecontentgenerator.cpp b/core/fpdfapi/fpdf_edit/cpdf_pagecontentgenerator.cpp
index 08bdb5bb0766cd02d9702321f4fdb4303ed994aa..6698a8e9ffa2d7cec5d0db70bba66d2166384153 100644
--- a/core/fpdfapi/fpdf_edit/cpdf_pagecontentgenerator.cpp
+++ b/core/fpdfapi/fpdf_edit/cpdf_pagecontentgenerator.cpp
@@ -47,11 +47,11 @@ void CPDF_PageContentGenerator::GenerateContent() {
     ProcessImage(buf, pPageObj->AsImage());
   }
   CPDF_Object* pContent =
-      pPageDict ? pPageDict->GetDirectObjectBy("Contents") : NULL;
+      pPageDict ? pPageDict->GetDirectObjectBy("Contents") : nullptr;
   if (pContent) {
     pPageDict->RemoveAt("Contents");
   }
-  CPDF_Stream* pStream = new CPDF_Stream(NULL, 0, NULL);
+  CPDF_Stream* pStream = new CPDF_Stream(nullptr, 0, nullptr);
   pStream->SetData(buf.GetBuffer(), buf.GetLength(), FALSE, FALSE);
   m_pDocument->AddIndirectObject(pStream);
   pPageDict->SetAtReference("Contents", m_pDocument, pStream->GetObjNum());
@@ -108,7 +108,7 @@ void CPDF_PageContentGenerator::ProcessForm(CFX_ByteTextBuf& buf,
   if (!data || !size) {
     return;
   }
-  CPDF_Stream* pStream = new CPDF_Stream(NULL, 0, NULL);
+  CPDF_Stream* pStream = new CPDF_Stream(nullptr, 0, nullptr);
   CPDF_Dictionary* pFormDict = new CPDF_Dictionary;
   pFormDict->SetAtName("Type", "XObject");
   pFormDict->SetAtName("Subtype", "Form");
@@ -122,7 +122,8 @@ void CPDF_PageContentGenerator::ProcessForm(CFX_ByteTextBuf& buf,
 }
 void CPDF_PageContentGenerator::TransformContent(CFX_Matrix& matrix) {
   CPDF_Dictionary* pDict = m_pPage->m_pFormDict;
-  CPDF_Object* pContent = pDict ? pDict->GetDirectObjectBy("Contents") : NULL;
+  CPDF_Object* pContent =
+      pDict ? pDict->GetDirectObjectBy("Contents") : nullptr;
   if (!pContent)
     return;
 
@@ -159,7 +160,7 @@ void CPDF_PageContentGenerator::TransformContent(CFX_Matrix& matrix) {
     contentStream.LoadAllData(pStream);
     ProcessForm(buf, contentStream.GetData(), contentStream.GetSize(), matrix);
   }
-  CPDF_Stream* pStream = new CPDF_Stream(NULL, 0, NULL);
+  CPDF_Stream* pStream = new CPDF_Stream(nullptr, 0, nullptr);
   pStream->SetData(buf.GetBuffer(), buf.GetLength(), FALSE, FALSE);
   m_pDocument->AddIndirectObject(pStream);
   m_pPage->m_pFormDict->SetAtReference("Contents", m_pDocument,