Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGTests.h

Index: Source/core/svg/SVGTests.h
diff --git a/Source/core/svg/SVGTests.h b/Source/core/svg/SVGTests.h
index 8ed2fc1222d26a2e149b620eb6d986f25172e314..89cb53aff9b8fc6f7a19c3fb1249bfd76b653d58 100644
--- a/Source/core/svg/SVGTests.h
+++ b/Source/core/svg/SVGTests.h
@@ -22,6 +22,7 @@
 #define SVGTests_h
 
 #include "core/svg/SVGStaticStringList.h"
+#include "platform/heap/Handle.h"
 #include "wtf/HashSet.h"
 
 namespace blink {
@@ -30,7 +31,7 @@ class Document;
 class QualifiedName;
 class SVGElement;
 
-class SVGTests {
+class SVGTests : public WillBeGarbageCollectedMixin {
 public:
     // JS API
     SVGStringListTearOff* requiredFeatures() { return m_requiredFeatures->tearOff(); }
@@ -45,13 +46,15 @@ public:
 
     void addSupportedAttributes(HashSet<QualifiedName>&);
 
+    virtual void trace(Visitor*);
+
 protected:
-    SVGTests(SVGElement* contextElement);
+    explicit SVGTests(SVGElement* contextElement);
 
 private:
-    RefPtr<SVGStaticStringList> m_requiredFeatures;
-    RefPtr<SVGStaticStringList> m_requiredExtensions;
-    RefPtr<SVGStaticStringList> m_systemLanguage;
+    RefPtrWillBeMember<SVGStaticStringList> m_requiredFeatures;
+    RefPtrWillBeMember<SVGStaticStringList> m_requiredExtensions;
+    RefPtrWillBeMember<SVGStaticStringList> m_systemLanguage;
 };
 
 } // namespace blink