CSS Tokenizer: Add an on-stack tokenizer scope

Source/core/css/parser/MediaQueryParser.cpp

Index: Source/core/css/parser/MediaQueryParser.cpp
diff --git a/Source/core/css/parser/MediaQueryParser.cpp b/Source/core/css/parser/MediaQueryParser.cpp
index 34f5c9b26ca99b83d421205862f0d9aeaa740486..4ae02e987411d651074e18c75d893c7eefea8ec1 100644
--- a/Source/core/css/parser/MediaQueryParser.cpp
+++ b/Source/core/css/parser/MediaQueryParser.cpp
@@ -14,11 +14,7 @@ namespace blink {
 
 PassRefPtrWillBeRawPtr<MediaQuerySet> MediaQueryParser::parseMediaQuerySet(const String& queryString)
 {
-    // FIXME: Replace the CSSTokenizer with a generic CSSTokenizer, once there is one,
-    // or better yet, replace the MediaQueryParser with a generic thread-safe CSS parser.
-    Vector<CSSParserToken> tokens;
-    CSSTokenizer::tokenize(queryString, tokens);
-    return parseMediaQuerySet(tokens);
+    return parseMediaQuerySet(CSSTokenizer::Scope(queryString).tokenRange());
 }
 
 PassRefPtrWillBeRawPtr<MediaQuerySet> MediaQueryParser::parseMediaQuerySet(CSSParserTokenRange range)