Oilpan: Reapply: Remove all the RefPtrs and most of the raw pointers to style

Source/core/xml/XSLImportRule.h

Index: Source/core/xml/XSLImportRule.h
diff --git a/Source/core/xml/XSLImportRule.h b/Source/core/xml/XSLImportRule.h
index 4d9a77a67e99b20370a589213ac15794b18ed2d0..3521e696d9d4ac849528c4f893207a1a7db1f76d 100644
--- a/Source/core/xml/XSLImportRule.h
+++ b/Source/core/xml/XSLImportRule.h
@@ -58,9 +58,12 @@ private:
 
     virtual void setXSLStyleSheet(const String& href, const KURL& baseURL, const String& sheet) OVERRIDE;
 
+    // FIXME: Oilpan: This raw pointer is safe and has to be kept raw at this
+    // point to avoid cycles. When XSLImportRule is moved to the oilpan heap
+    // it should be a Member and be traced.
     XSLStyleSheet* m_parentStyleSheet;
     String m_strHref;
-    RefPtr<XSLStyleSheet> m_styleSheet;
+    RefPtrWillBePersistent<XSLStyleSheet> m_styleSheet;
     ResourcePtr<XSLStyleSheetResource> m_resource;
     bool m_loading;
 };