Make CSSParserContext be garbage collected.

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 238 matching lines @@
     CSSVariableReferenceValue* shorthandValue = pendingValue.shorthandValue();
     CSSPropertyID shorthandPropertyId = pendingValue.shorthandPropertyId();
 
     CSSVariableResolver resolver(state);
 
     Vector<CSSParserToken> tokens;
     bool isAnimationTainted = false;
     if (resolver.resolveTokenRange(
             shorthandValue->variableDataValue()->tokens(),
             disallowAnimationTainted, tokens, isAnimationTainted)) {
-      CSSParserContext context(HTMLStandardMode, 0);
+      CSSParserContext* context = CSSParserContext::create(HTMLStandardMode);
 
       HeapVector<CSSProperty, 256> parsedProperties;
 
       if (CSSPropertyParser::parseValue(
               shorthandPropertyId, false, CSSParserTokenRange(tokens), context,
               parsedProperties, StyleRule::RuleType::Style)) {
         unsigned parsedPropertiesCount = parsedProperties.size();
         for (unsigned i = 0; i < parsedPropertiesCount; ++i) {
           propertyCache.set(parsedProperties[i].id(),
                             parsedProperties[i].value());
@@ skipping 61 matching lines @@
 CSSVariableResolver::CSSVariableResolver(const StyleResolverState& state)
     : m_inheritedVariables(state.style()->inheritedVariables()),
       m_nonInheritedVariables(state.style()->nonInheritedVariables()),
       m_registry(state.document().propertyRegistry()) {}
 
 DEFINE_TRACE(CSSVariableResolver) {
   visitor->trace(m_registry);
 }
 
 }  // namespace blink