Oilpan: Change Persistent members of Resource subclasses to Member.

Source/core/fetch/CSSStyleSheetResource.cpp

Index: Source/core/fetch/CSSStyleSheetResource.cpp
diff --git a/Source/core/fetch/CSSStyleSheetResource.cpp b/Source/core/fetch/CSSStyleSheetResource.cpp
index 8f16d80268d5cc8fc9b33257924e3f7d6c156958..a7604e7e2efebf6b77cefb10b27e5ee60eccb04b 100644
--- a/Source/core/fetch/CSSStyleSheetResource.cpp
+++ b/Source/core/fetch/CSSStyleSheetResource.cpp
@@ -60,6 +60,12 @@ void CSSStyleSheetResource::dispose()
     m_parsedStyleSheetCache.clear();
 }
 
+void CSSStyleSheetResource::trace(Visitor* visitor)
+{
+    visitor->trace(m_parsedStyleSheetCache);
+    StyleSheetResource::trace(visitor);
+}
+
 void CSSStyleSheetResource::didAddClient(ResourceClient* c)
 {
     ASSERT(c->resourceClientType() == StyleSheetResourceClient::expectedType());