Move MediaQuery classes off BlinkGC heap

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

Index: third_party/WebKit/Source/core/css/parser/SizesAttributeParser.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/SizesAttributeParser.cpp b/third_party/WebKit/Source/core/css/parser/SizesAttributeParser.cpp
index 3709e4a2028f44986229e34fc2f2a98a5c3fc5dc..6c4baedd9f211c1a6bed46b96ca5e37c836ff308 100644
--- a/third_party/WebKit/Source/core/css/parser/SizesAttributeParser.cpp
+++ b/third_party/WebKit/Source/core/css/parser/SizesAttributeParser.cpp
@@ -53,7 +53,7 @@ bool SizesAttributeParser::calculateLengthInPixels(CSSParserTokenRange range,
 }
 
 bool SizesAttributeParser::mediaConditionMatches(
-    MediaQuerySet* mediaCondition) {
+    const MediaQuerySet& mediaCondition) {
   // A Media Condition cannot have a media type other then screen.
   MediaQueryEvaluator mediaQueryEvaluator(*m_mediaValues);
   return mediaQueryEvaluator.eval(mediaCondition);
@@ -80,9 +80,10 @@ bool SizesAttributeParser::parse(CSSParserTokenRange range) {
     if (!calculateLengthInPixels(
             range.makeSubRange(lengthTokenStart, lengthTokenEnd), length))
       continue;
-    MediaQuerySet* mediaCondition = MediaQueryParser::parseMediaCondition(
-        range.makeSubRange(mediaConditionStart, lengthTokenStart));
-    if (!mediaCondition || !mediaConditionMatches(mediaCondition))
+    RefPtr<MediaQuerySet> mediaCondition =
+        MediaQueryParser::parseMediaCondition(
+            range.makeSubRange(mediaConditionStart, lengthTokenStart));
+    if (!mediaCondition || !mediaConditionMatches(*mediaCondition))
       continue;
     m_length = length;
     m_lengthWasSet = true;