Oilpan: provide a weak 'this' pointer abstraction for cancellable closures.

third_party/WebKit/Source/platform/scheduler/CancellableTaskFactory.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CancellableTaskFactory_h
 #define CancellableTaskFactory_h
 
 #include "platform/PlatformExport.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebScheduler.h"
@@ skipping 22 matching lines @@
     // In the Oilpan case, as WTF::Closure objects are off-heap, we have to construct the
     // closure in such a manner that it doesn't end up referring back to the owning heap
     // object with a strong Persistent<> GC root reference. If we do, this will create
     // a heap <-> off-heap cycle and leak, the owning object can never be GCed.
     // Instead, the closure will keep an off-heap persistent reference of the weak
     // variety, which will refer back to the owner heap object safely (but weakly.)
     //
     template<typename T>
     static PassOwnPtr<CancellableTaskFactory> create(T* thisObject, void (T::*method)(), typename std::enable_if<IsGarbageCollectedType<T>::value>::type* = nullptr)
     {
-        return adoptPtr(new CancellableTaskFactory(WTF::bind(method, AllowCrossThreadWeakPersistent<T>(thisObject))));
+        return adoptPtr(new CancellableTaskFactory(WTF::bind(method, CrossThreadWeakPersistentThisPointer<T>(thisObject))));
     }
 
     template<typename T>
     static PassOwnPtr<CancellableTaskFactory> create(T* thisObject, void (T::*method)(), typename std::enable_if<!IsGarbageCollectedType<T>::value>::type* = nullptr)
     {
         return adoptPtr(new CancellableTaskFactory(WTF::bind(method, thisObject)));
     }
 
     bool isPending() const
     {
@@ skipping 32 matching lines @@
         WeakPtr<CancellableTaskFactory> m_weakPtr;
     };
 
     OwnPtr<Closure> m_closure;
     WeakPtrFactory<CancellableTaskFactory> m_weakPtrFactory;
 };
 
 } // namespace blink
 
 #endif // CancellableTaskFactory_h