Call MainThreadLoaderHolder::cancel as a pre-finalizer

third_party/WebKit/Source/core/loader/WorkerThreadableLoader.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 119 matching lines @@
 
   // An instance of this class lives in the main thread. It is a
   // ThreadableLoaderClient for a DocumentThreadableLoader and forward
   // notifications to the associated WorkerThreadableLoader living in the
   // worker thread.
   class MainThreadLoaderHolder final
       : public GarbageCollectedFinalized<MainThreadLoaderHolder>,
         public ThreadableLoaderClient,
         public WorkerThreadLifecycleObserver {
     USING_GARBAGE_COLLECTED_MIXIN(MainThreadLoaderHolder);
+    USING_PRE_FINALIZER(MainThreadLoaderHolder, cancel);
 
    public:
     static void createAndStart(WorkerThreadableLoader*,
                                PassRefPtr<WorkerLoaderProxy>,
                                WorkerThreadLifecycleContext*,
                                std::unique_ptr<CrossThreadResourceRequestData>,
                                const ThreadableLoaderOptions&,
                                const ResourceLoaderOptions&,
                                PassRefPtr<WaitableEventWithTasks>,
                                ExecutionContext*);
@@ skipping 66 matching lines @@
   ResourceLoaderOptions m_resourceLoaderOptions;
   BlockingBehavior m_blockingBehavior;
 
   // |*m_mainThreadLoaderHolder| lives in the main thread.
   CrossThreadPersistent<MainThreadLoaderHolder> m_mainThreadLoaderHolder;
 };
 
 }  // namespace blink
 
 #endif  // WorkerThreadableLoader_h