Dispose ApplicationCacheHost on DocumentLoader finalization.

Source/core/loader/appcache/ApplicationCacheHost.h

 /*
  * Copyright (c) 2009, 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 34 matching lines @@
 
     class ApplicationCacheHost FINAL : public NoBaseWillBeGarbageCollectedFinalized<ApplicationCacheHost>, public WebApplicationCacheHostClient {
         WTF_MAKE_NONCOPYABLE(ApplicationCacheHost);
     public:
         static PassOwnPtrWillBeRawPtr<ApplicationCacheHost> create(DocumentLoader* loader)
         {
             return adoptPtrWillBeNoop(new ApplicationCacheHost(loader));
         }
         virtual ~ApplicationCacheHost();
 
+        void dispose();
+
         // The Status numeric values are specified in the HTML5 spec.
         enum Status {
             UNCACHED = 0,
             IDLE = 1,
             CHECKING = 2,
             DOWNLOADING = 3,
             UPDATEREADY = 4,
             OBSOLETE = 5
         };
 
@@ skipping 104 matching lines @@
         Vector<DeferredEvent> m_deferredEvents;
 
         void dispatchDOMEvent(EventID, int progressTotal, int progressDone, WebApplicationCacheHost::ErrorReason, const String& errorURL, int errorStatus, const String& errorMessage);
 
         OwnPtr<WebApplicationCacheHost> m_host;
     };
 
 }  // namespace blink
 
 #endif  // ApplicationCacheHost_h