CSS Tokenizer: Add an on-stack tokenizer scope

Source/core/css/parser/CSSParserImpl.h

 // 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.
 
 #ifndef CSSParserImpl_h
 #define CSSParserImpl_h
 
 #include "core/CSSPropertyNames.h"
 #include "core/css/CSSProperty.h"
 #include "core/css/CSSPropertySourceData.h"
@@ skipping 17 matching lines @@
 class StyleRuleSupports;
 class StyleRuleViewport;
 class StyleSheetContents;
 class ImmutableStylePropertySet;
 class Element;
 class MutableStylePropertySet;
 
 class CSSParserImpl {
     STACK_ALLOCATED();
 public:
-    CSSParserImpl(const CSSParserContext&, const String&, StyleSheetContents* = nullptr);
+    CSSParserImpl(const CSSParserContext&, StyleSheetContents* = nullptr);
 
     enum AllowedRulesType {
         // As per css-syntax, css-cascade and css-namespaces, @charset rules
         // must come first, followed by @import then @namespace.
         // AllowImportRules actually means we allow @import and any rules thay
         // may follow it, i.e. @namespace rules and regular rules.
         // AllowCharsetRules and AllowNamespaceRules behave similarly.
         AllowCharsetRules,
         AllowImportRules,
         AllowNamespaceRules,
@@ skipping 39 matching lines @@
 
     void consumeDeclarationList(CSSParserTokenRange, StyleRule::Type);
     void consumeDeclaration(CSSParserTokenRange, StyleRule::Type);
     void consumeDeclarationValue(CSSParserTokenRange, CSSPropertyID, bool important, StyleRule::Type);
 
     static PassOwnPtr<Vector<double>> consumeKeyframeKeyList(CSSParserTokenRange);
 
     // FIXME: Can we build StylePropertySets directly?
     // FIXME: Investigate using a smaller inline buffer
     WillBeHeapVector<CSSProperty, 256> m_parsedProperties;
-    Vector<CSSParserToken> m_tokens;
     CSSParserContext m_context;
 
     AtomicString m_defaultNamespace;
     RawPtrWillBeMember<StyleSheetContents> m_styleSheet;
 };
 
 } // namespace blink
 
 #endif // CSSParserImpl_h