0 -> nullptr for UseCounter pointer in CSSParserContext.

third_party/WebKit/Source/core/css/parser/CSSParser.cpp

 // Copyright 2014 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/parser/CSSParser.h"
 
 #include "core/css/CSSColorValue.h"
 #include "core/css/CSSKeyframeRule.h"
 #include "core/css/StyleColor.h"
 #include "core/css/StylePropertySet.h"
@@ skipping 50 matching lines @@
 
 bool CSSParser::parseValue(MutableStylePropertySet* declaration, CSSPropertyID unresolvedProperty, const String& string, bool important, StyleSheetContents* styleSheet)
 {
     if (string.isEmpty())
         return false;
     CSSPropertyID resolvedProperty = resolveCSSPropertyID(unresolvedProperty);
     CSSParserMode parserMode = declaration->cssParserMode();
     CSSValue* value = CSSParserFastPaths::maybeParseValue(resolvedProperty, string, parserMode);
     if (value)
         return declaration->setProperty(CSSProperty(resolvedProperty, *value, important));
-    CSSParserContext context(parserMode, 0);
+    CSSParserContext context(parserMode, nullptr);
     if (styleSheet) {
         context = styleSheet->parserContext();
         context.setMode(parserMode);
     }
     return parseValue(declaration, unresolvedProperty, string, important, context);
 }
 
 bool CSSParser::parseValueForCustomProperty(MutableStylePropertySet* declaration, const AtomicString& propertyName, const String& value, bool important, StyleSheetContents* styleSheet)
 {
     ASSERT(RuntimeEnabledFeatures::cssVariablesEnabled() && CSSVariableParser::isValidVariableName(propertyName));
     if (value.isEmpty())
         return false;
     CSSParserMode parserMode = declaration->cssParserMode();
-    CSSParserContext context(parserMode, 0);
+    CSSParserContext context(parserMode, nullptr);
     if (styleSheet) {
         context = styleSheet->parserContext();
         context.setMode(parserMode);
     }
     return CSSParserImpl::parseVariableValue(declaration, propertyName, value, important, context);
 }
 
 ImmutableStylePropertySet* CSSParser::parseCustomPropertySet(CSSParserTokenRange range)
 {
     return CSSParserImpl::parseCustomPropertySet(range);
@@ skipping 79 matching lines @@
     builder.append(" : ");
     builder.append(propertyValue);
     builder.append("; }");
     StyleRuleBase* rule = parseRule(context, nullptr, builder.toString());
     if (!rule || !rule->isFontFaceRule())
         return nullptr;
     return toStyleRuleFontFace(rule)->properties().getPropertyCSSValue(propertyID);
 }
 
 } // namespace blink