Tidy up releasing of AssociatedURLLoader's client references.

third_party/WebKit/Source/web/AssociatedURLLoader.h

 /*
  * Copyright (C) 2010, 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 53 matching lines @@
     // Called by ClientAdapter to handle completion of loading.
     void clientAdapterDone();
 
 private:
     class ClientAdapter;
     class Observer;
 
     void cancelLoader();
     void disposeObserver();
 
+    WebURLLoaderClient* releaseClient()
+    {
+        WebURLLoaderClient* client = m_client;
+        m_client = nullptr;
+        return client;
+    }
+
     WebURLLoaderClient* m_client;
     WebURLLoaderOptions m_options;
 
     // An adapter which converts the DocumentThreadableLoaderClient method
     // calls into the WebURLLoaderClient method calls.
     OwnPtr<ClientAdapter> m_clientAdapter;
     OwnPtr<DocumentThreadableLoader> m_loader;
 
     // A ContextLifecycleObserver for cancelling |m_loader| when the Document
     // is detached.
     Persistent<Observer> m_observer;
 };
 
 } // namespace blink
 
 #endif