0 -> nullptr for UseCounter pointer in CSSParserContext.

third_party/WebKit/Source/core/css/resolver/CSSVariableResolver.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/resolver/CSSVariableResolver.h"
 
 #include "core/CSSPropertyNames.h"
 #include "core/CSSValueKeywords.h"
 #include "core/StyleBuilderFunctions.h"
 #include "core/StylePropertyShorthand.h"
@@ skipping 131 matching lines @@
         return CSSUnsetValue::create();
     return result;
 }
 
 void CSSVariableResolver::resolveAndApplyVariableReferences(StyleResolverState& state, CSSPropertyID id, const CSSVariableReferenceValue& value)
 {
     CSSVariableResolver resolver(state.style()->variables());
 
     Vector<CSSParserToken> tokens;
     if (resolver.resolveTokenRange(value.variableDataValue()->tokens(), tokens)) {
-        CSSParserContext context(HTMLStandardMode, 0);
+        CSSParserContext context(HTMLStandardMode, nullptr);
 
         HeapVector<CSSProperty, 256> parsedProperties;
 
         // TODO: Non-shorthands should just call CSSPropertyParser::parseSingleValue
         if (CSSPropertyParser::parseValue(id, false, CSSParserTokenRange(tokens), context, parsedProperties, StyleRule::RuleType::Style)) {
             unsigned parsedPropertiesCount = parsedProperties.size();
             for (unsigned i = 0; i < parsedPropertiesCount; ++i)
                 StyleBuilder::applyProperty(parsedProperties[i].id(), state, *parsedProperties[i].value());
             return;
         }
@@ skipping 21 matching lines @@
             variable.value = resolver.resolveCustomProperty(variable.key, *variable.value);
     }
 }
 
 CSSVariableResolver::CSSVariableResolver(StyleVariableData* styleVariableData)
     : m_styleVariableData(styleVariableData)
 {
 }
 
 } // namespace blink