Revert of Oilpan: enable appcache + move DocumentLoader to the heap.

Source/core/loader/appcache/ApplicationCacheHost.h

Index: Source/core/loader/appcache/ApplicationCacheHost.h
diff --git a/Source/core/loader/appcache/ApplicationCacheHost.h b/Source/core/loader/appcache/ApplicationCacheHost.h
index 95aae19307c8a92aa6ce92a6bbaacfc86d0fb4ef..a6087eaa622010625d4e18ae7b0f24db8fb519b0 100644
--- a/Source/core/loader/appcache/ApplicationCacheHost.h
+++ b/Source/core/loader/appcache/ApplicationCacheHost.h
@@ -43,16 +43,16 @@
     class ResourceRequest;
     class ResourceResponse;
 
-    class ApplicationCacheHost final : public GarbageCollectedFinalized<ApplicationCacheHost>, public WebApplicationCacheHostClient {
+    class ApplicationCacheHost final : public NoBaseWillBeGarbageCollectedFinalized<ApplicationCacheHost>, public WebApplicationCacheHostClient {
         WTF_MAKE_NONCOPYABLE(ApplicationCacheHost);
     public:
-        static ApplicationCacheHost* create(DocumentLoader* loader)
+        static PassOwnPtrWillBeRawPtr<ApplicationCacheHost> create(DocumentLoader* loader)
         {
-            return new ApplicationCacheHost(loader);
+            return adoptPtrWillBeNoop(new ApplicationCacheHost(loader));
         }
+        virtual ~ApplicationCacheHost();
 
-        virtual ~ApplicationCacheHost();
-        void detachFromDocumentLoader();
+        void dispose();
 
         // The Status numeric values are specified in the HTML5 spec.
         enum Status {
@@ -165,8 +165,8 @@
             }
         };
 
-        WeakMember<ApplicationCache> m_domApplicationCache;
-        RawPtrWillBeMember<DocumentLoader> m_documentLoader;
+        RawPtrWillBeWeakMember<ApplicationCache> m_domApplicationCache;
+        DocumentLoader* m_documentLoader;
         bool m_defersEvents; // Events are deferred until after document onload.
         Vector<DeferredEvent> m_deferredEvents;