0 -> nullptr for UseCounter pointer in CSSParserContext.

third_party/WebKit/Source/core/inspector/InspectorStyleSheet.cpp

 /*
  * Copyright (C) 2010, 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:
  * 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
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 51 matching lines @@
 using blink::RuleSourceDataList;
 using blink::CSSRuleSourceData;
 using blink::CSSStyleSheet;
 
 namespace {
 
 using namespace blink;
 
 static CSSParserContext parserContextForDocument(Document *document)
 {
-    return document ? CSSParserContext(*document, 0) : strictCSSParserContext();
+    return document ? CSSParserContext(*document, nullptr) : strictCSSParserContext();
 }
 
 class StyleSheetHandler final : public CSSParserObserver {
 public:
     StyleSheetHandler(const String& parsedText, Document* document, RuleSourceDataList* result)
         : m_parsedText(parsedText)
         , m_document(document)
         , m_result(result)
         , m_currentRuleData(nullptr)
         , m_currentMediaQueryData(nullptr)
@@ skipping 1697 matching lines @@
 }
 
 DEFINE_TRACE(InspectorStyleSheetForInlineStyle)
 {
     visitor->trace(m_element);
     visitor->trace(m_inspectorStyle);
     InspectorStyleSheetBase::trace(visitor);
 }
 
 } // namespace blink