Oilpan: enable appcache + move DocumentLoader to the heap.

Source/core/loader/FrameLoader.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) Research In Motion Limited 2009. All rights reserved.
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
@@ skipping 208 matching lines @@
     mutable FrameLoaderStateMachine m_stateMachine;
 
     OwnPtrWillBeMember<ProgressTracker> m_progressTracker;
 
     FrameLoadType m_loadType;
 
     // Document loaders for the three phases of frame loading. Note that while
     // a new request is being loaded, the old document loader may still be referenced.
     // E.g. while a new request is in the "policy" state, the old document loader may
     // be consulted in particular as it makes sense to imply certain settings on the new loader.
-    RefPtr<DocumentLoader> m_documentLoader;
-    RefPtr<DocumentLoader> m_provisionalDocumentLoader;
-    RefPtr<DocumentLoader> m_policyDocumentLoader;
+    RefPtrWillBeMember<DocumentLoader> m_documentLoader;
+    RefPtrWillBeMember<DocumentLoader> m_provisionalDocumentLoader;
+    RefPtrWillBeMember<DocumentLoader> m_policyDocumentLoader;
 
     RefPtrWillBeMember<HistoryItem> m_currentItem;
     RefPtrWillBeMember<HistoryItem> m_provisionalItem;
 
     class DeferredHistoryLoad : public NoBaseWillBeGarbageCollectedFinalized<DeferredHistoryLoad> {
         DISALLOW_COPY(DeferredHistoryLoad);
     public:
         static PassOwnPtrWillBeRawPtr<DeferredHistoryLoad> create(ResourceRequest request, HistoryItem* item, FrameLoadType loadType, HistoryLoadType historyLoadType)
         {
             return adoptPtrWillBeNoop(new DeferredHistoryLoad(request, item, loadType, historyLoadType));
@@ skipping 29 matching lines @@
     Timer<FrameLoader> m_didAccessInitialDocumentTimer;
 
     SandboxFlags m_forcedSandboxFlags;
 
     bool m_dispatchingDidClearWindowObjectInMainWorld;
 };
 
 } // namespace blink
 
 #endif // FrameLoader_h