Oilpan: fix build after r171843.

Source/core/css/parser/SizesAttributeParser.h

Index: Source/core/css/parser/SizesAttributeParser.h
diff --git a/Source/core/css/parser/SizesAttributeParser.h b/Source/core/css/parser/SizesAttributeParser.h
index 4c6b73f8a4d0b17c4ec2e8ba5c0b864e6251db80..52d34a6ae69da91ea38231b84da788cc0c13bb89 100644
--- a/Source/core/css/parser/SizesAttributeParser.h
+++ b/Source/core/css/parser/SizesAttributeParser.h
@@ -7,11 +7,13 @@
 
 #include "core/css/MediaValues.h"
 #include "core/css/parser/MediaQueryParser.h"
+#include "platform/heap/Handle.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class SizesAttributeParser {
+    STACK_ALLOCATED();
 public:
     static unsigned findEffectiveSize(const String& attribute, PassRefPtr<MediaValues>);
 
@@ -26,10 +28,10 @@ private:
     bool parseMediaConditionAndLength(TokenIterator startToken, TokenIterator endToken);
     unsigned effectiveSize();
     bool calculateLengthInPixels(TokenIterator startToken, TokenIterator endToken, unsigned& result);
-    bool mediaConditionMatches(PassRefPtr<MediaQuerySet> mediaCondition);
+    bool mediaConditionMatches(PassRefPtrWillBeRawPtr<MediaQuerySet> mediaCondition);
     unsigned effectiveSizeDefaultValue();
 
-    RefPtr<MediaQuerySet> m_mediaCondition;
+    RefPtrWillBeMember<MediaQuerySet> m_mediaCondition;
     RefPtr<MediaValues> m_mediaValues;
     unsigned m_length;
 };