Use nullptr instead of 0 in xml and xmlhttprequest.

Source/core/xml/XSLTUnicodeSort.cpp

 /*
  * Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 33 matching lines @@
 // Based on default implementation from libxslt 1.1.22 and xsltICUSort.c
 // example.
 void xsltUnicodeSortFunction(xsltTransformContextPtr ctxt, xmlNodePtr *sorts, int nbsorts)
 {
 #ifdef XSLT_REFACTORED
     xsltStyleItemSortPtr comp;
 #else
     xsltStylePreCompPtr comp;
 #endif
     xmlXPathObjectPtr* resultsTab[XSLT_MAX_SORT];
-    xmlXPathObjectPtr* results = 0;
-    xmlNodeSetPtr list = 0;
+    xmlXPathObjectPtr* results = nullptr;
+    xmlNodeSetPtr list = nullptr;
     int depth;
     xmlNodePtr node;
     int tempstype[XSLT_MAX_SORT], temporder[XSLT_MAX_SORT];
 
     if (!ctxt || !sorts || nbsorts <= 0 || nbsorts >= XSLT_MAX_SORT)
         return;
     if (!sorts[0])
         return;
     comp = static_cast<xsltStylePreComp*>(sorts[0]->psvi);
     if (!comp)
@@ skipping 200 matching lines @@
         }
         if (resultsTab[j]) {
             for (int i = 0; i < len; ++i)
                 xmlXPathFreeObject(resultsTab[j][i]);
             xmlFree(resultsTab[j]);
         }
     }
 }
 
 } // namespace blink