Revert of Move ThreadableLoader to Oilpan heap (2/3)

third_party/WebKit/Source/core/loader/DocumentThreadableLoader.h

Index: third_party/WebKit/Source/core/loader/DocumentThreadableLoader.h
diff --git a/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.h b/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.h
index 227541be515c738c74ac6cae5ff628d15698b6d3..1cb373de7f44c2ed08f342fe6fc4577cbf104dbb 100644
--- a/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.h
+++ b/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.h
@@ -55,9 +55,10 @@
 class ThreadableLoaderClient;
 
 class CORE_EXPORT DocumentThreadableLoader final : public ThreadableLoader, private RawResourceClient {
+    USING_FAST_MALLOC(DocumentThreadableLoader);
     public:
         static void loadResourceSynchronously(Document&, const ResourceRequest&, ThreadableLoaderClient&, const ThreadableLoaderOptions&, const ResourceLoaderOptions&);
-        static DocumentThreadableLoader* create(Document&, ThreadableLoaderClient*, const ThreadableLoaderOptions&, const ResourceLoaderOptions&);
+        static std::unique_ptr<DocumentThreadableLoader> create(Document&, ThreadableLoaderClient*, const ThreadableLoaderOptions&, const ResourceLoaderOptions&);
         ~DocumentThreadableLoader() override;
 
         void start(const ResourceRequest&) override;
@@ -67,8 +68,6 @@
         // |this| may be dead after calling this method in async mode.
         void cancel() override;
         void setDefersLoading(bool);
-
-        DECLARE_TRACE();
 
     private:
         enum BlockingBehavior {
@@ -170,14 +169,14 @@
                 m_resource->addClient(this);
             }
         }
-        Member<RawResource> m_resource;
+        Persistent<RawResource> m_resource;
         // End of ResourceOwner re-implementation, see above.
 
         SecurityOrigin* getSecurityOrigin() const;
         Document& document() const;
 
         ThreadableLoaderClient* m_client;
-        Member<Document> m_document;
+        WeakPersistent<Document> m_document;
 
         const ThreadableLoaderOptions m_options;
         // Some items may be overridden by m_forceDoNotAllowStoredCredentials