Fix oilpan build of MediaQuerySetTest.

Source/core/css/MediaQuerySetTest.cpp

Index: Source/core/css/MediaQuerySetTest.cpp
diff --git a/Source/core/css/MediaQuerySetTest.cpp b/Source/core/css/MediaQuerySetTest.cpp
index 5b9814f1da78eff71deb7fd1221e93303cc23b10..3cc7bdd296e4c16fbca45c3cbf0b218c16870304 100644
--- a/Source/core/css/MediaQuerySetTest.cpp
+++ b/Source/core/css/MediaQuerySetTest.cpp
@@ -119,7 +119,7 @@ TEST(MediaQueryParserTest, Basic)
     };
 
     for (unsigned i = 0; testCases[i].input; ++i) {
-        RefPtr<MediaQuerySet> querySet = MediaQuerySet::create(testCases[i].input);
+        RefPtrWillBeRawPtr<MediaQuerySet> querySet = MediaQuerySet::create(testCases[i].input);
         StringBuilder output;
         char outputCharArray[outputCharArrayLen];
         size_t j = 0;