Replace CSSParserString with StringView.

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

Index: third_party/WebKit/Source/core/css/parser/MediaQueryParser.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/MediaQueryParser.cpp b/third_party/WebKit/Source/core/css/parser/MediaQueryParser.cpp
index 1b2dbe8350b140b01f44638de4089c0ba6d61824..6ee986250261574fc6dd4b8d2380644cec3632fc 100644
--- a/third_party/WebKit/Source/core/css/parser/MediaQueryParser.cpp
+++ b/third_party/WebKit/Source/core/css/parser/MediaQueryParser.cpp
@@ -96,7 +96,7 @@ void MediaQueryParser::readMediaType(CSSParserTokenType type, const CSSParserTok
             && isRestrictorOrLogicalOperator(token)) {
             m_state = SkipUntilComma;
         } else {
-            m_mediaQueryData.setMediaType(token.value());
+            m_mediaQueryData.setMediaType(token.value().toString());
             m_state = ReadAnd;
         }
     } else if (type == EOFToken && (!m_querySet->queryVector().size() || m_state != ReadRestrictor)) {
@@ -133,7 +133,7 @@ void MediaQueryParser::readFeatureStart(CSSParserTokenType type, const CSSParser
 void MediaQueryParser::readFeature(CSSParserTokenType type, const CSSParserToken& token)
 {
     if (type == IdentToken) {
-        m_mediaQueryData.setMediaFeature(token.value());
+        m_mediaQueryData.setMediaFeature(token.value().toString());
         m_state = ReadFeatureColon;
     } else {
         m_state = SkipUntilComma;