Use nullptr instead of 0 in xml and xmlhttprequest.

Source/core/xml/XSLTProcessorLibxslt.cpp

Index: Source/core/xml/XSLTProcessorLibxslt.cpp
diff --git a/Source/core/xml/XSLTProcessorLibxslt.cpp b/Source/core/xml/XSLTProcessorLibxslt.cpp
index fb2e286a9c8afd0c90315bee9ceaf02ecd71ea3f..b8da3002c6038a7c7eebc565573acaf75981e059 100644
--- a/Source/core/xml/XSLTProcessorLibxslt.cpp
+++ b/Source/core/xml/XSLTProcessorLibxslt.cpp
@@ -90,7 +90,7 @@ static xmlDocPtr docLoaderFunc(
     const xmlChar* uri, xmlDictPtr, int options, void* ctxt, xsltLoadType type)
 {
     if (!globalProcessor)
-        return 0;
+        return nullptr;
 
     switch (type) {
     case XSLT_LOAD_DOCUMENT: {
@@ -104,7 +104,7 @@ static xmlDocPtr docLoaderFunc(
         request.setOriginRestriction(FetchRequest::RestrictToSameOrigin);
         ResourcePtr<Resource> resource = globalResourceFetcher->fetchSynchronously(request);
         if (!resource || !globalProcessor)
-            return 0;
+            return nullptr;
 
         FrameConsole* console = 0;

[sof, 2015/06/08 07:09:06]

s/0/nullptr/

         LocalFrame* frame = globalProcessor->xslStylesheet()->ownerDocument()->frame();
@@ -129,7 +129,7 @@ static xmlDocPtr docLoaderFunc(
         break;
     }
 
-    return 0;
+    return nullptr;
 }
 
 static inline void setXSLTLoadCallBack(xsltDocLoaderFunc func, XSLTProcessor* processor, ResourceFetcher* fetcher)
@@ -190,7 +190,7 @@ static bool saveResultToString(xmlDocPtr resultDoc, xsltStylesheetPtr sheet, Str
 static const char** xsltParamArrayFromParameterMap(XSLTProcessor::ParameterMap& parameters)
 {
     if (parameters.isEmpty())
-        return 0;
+        return nullptr;
 
     const char** parameterArray = static_cast<const char**>(fastMalloc(((parameters.size() * 2) + 1) * sizeof(char*)));
 
@@ -234,7 +234,7 @@ static xsltStylesheetPtr xsltStylesheetPointer(Document* document, RefPtrWillBeM
     }
 
     if (!cachedStylesheet || !cachedStylesheet->document())
-        return 0;
+        return nullptr;
 
     return cachedStylesheet->compileStyleSheet();
 }