CSS Tokenizer: Add an on-stack tokenizer scope

Source/core/css/parser/CSSParserImpl.h

Index: Source/core/css/parser/CSSParserImpl.h
diff --git a/Source/core/css/parser/CSSParserImpl.h b/Source/core/css/parser/CSSParserImpl.h
index e8c6e95328105f62fe6c59a9bba34a077b7c485c..cf1322b597b8b70767840be93e47db3c7bd23e0b 100644
--- a/Source/core/css/parser/CSSParserImpl.h
+++ b/Source/core/css/parser/CSSParserImpl.h
@@ -35,7 +35,7 @@ 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
@@ -95,7 +95,6 @@ private:
     // 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;