Oilpan: enable appcache + move DocumentLoader to the heap.

Source/core/loader/EmptyClients.cpp

Index: Source/core/loader/EmptyClients.cpp
diff --git a/Source/core/loader/EmptyClients.cpp b/Source/core/loader/EmptyClients.cpp
index 2c1391a77760ea63b1953d5ea4dfd46e6150d7cd..0a79e34ee061806f5227b390bbc1ce9507d10fef 100644
--- a/Source/core/loader/EmptyClients.cpp
+++ b/Source/core/loader/EmptyClients.cpp
@@ -109,7 +109,7 @@ void EmptyFrameLoaderClient::dispatchWillSubmitForm(HTMLFormElement*)
 {
 }
 
-PassRefPtr<DocumentLoader> EmptyFrameLoaderClient::createDocumentLoader(LocalFrame* frame, const ResourceRequest& request, const SubstituteData& substituteData)
+PassRefPtrWillBeRawPtr<DocumentLoader> EmptyFrameLoaderClient::createDocumentLoader(LocalFrame* frame, const ResourceRequest& request, const SubstituteData& substituteData)
 {
     return DocumentLoader::create(frame, request, substituteData);
 }