0 -> nullptr for UseCounter pointer in CSSParserContext.

third_party/WebKit/Source/web/WebDocument.cpp

 /*
  * Copyright (C) 2009 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 195 matching lines @@
 
 WebElement WebDocument::focusedElement() const
 {
     return WebElement(constUnwrap<Document>()->focusedElement());
 }
 
 void WebDocument::insertStyleSheet(const WebString& sourceCode)
 {
     Document* document = unwrap<Document>();
     DCHECK(document);
-    StyleSheetContents* parsedSheet = StyleSheetContents::create(CSSParserContext(*document, 0));
+    StyleSheetContents* parsedSheet = StyleSheetContents::create(CSSParserContext(*document, nullptr));
     parsedSheet->parseString(sourceCode);
     document->styleEngine().injectAuthorSheet(parsedSheet);
 }
 
 void WebDocument::watchCSSSelectors(const WebVector<WebString>& webSelectors)
 {
     Document* document = unwrap<Document>();
     CSSSelectorWatch* watch = CSSSelectorWatch::fromIfExists(*document);
     if (!watch && webSelectors.isEmpty())
         return;
@@ skipping 100 matching lines @@
     m_private = elem;
     return *this;
 }
 
 WebDocument::operator Document*() const
 {
     return toDocument(m_private.get());
 }
 
 } // namespace blink