Oilpan: have PromiseTracker callback keep a WeakPersistent<>.

Source/core/inspector/PromiseTracker.h

 // Copyright 2014 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 PromiseTracker_h
 #define PromiseTracker_h
 
 #include "bindings/core/v8/V8GlobalValueMap.h"
 #include "core/CoreExport.h"
 #include "core/InspectorFrontend.h"
@@ skipping 41 matching lines @@
     int promiseId(v8::Local<v8::Object> promise, bool* isNewPromise);
 
     int m_circularSequentialId;
     bool m_isEnabled;
     bool m_captureStacks;
     RawPtrWillBeMember<Listener> m_listener;
 
     v8::Isolate* m_isolate;
     v8::Persistent<v8::NativeWeakMap> m_promiseToId;
 
+#if !ENABLE(OILPAN)
     WeakPtrFactory<PromiseTracker> m_weakPtrFactory;
+#endif
 
     class PromiseWeakCallbackData;
     class IdToPromiseMapTraits : public V8GlobalValueMapTraits<int, v8::Object, v8::kWeakWithParameter> {
     public:
         // Weak traits:
         typedef PromiseWeakCallbackData WeakCallbackDataType;
         typedef v8::GlobalValueMap<int, v8::Object, IdToPromiseMapTraits> MapType;
 
         static WeakCallbackDataType* WeakCallbackParameter(MapType*, int key, v8::Local<v8::Object>& value);
         static void OnWeakCallback(const v8::WeakCallbackInfo<WeakCallbackDataType>&) { }
         // This method will be called if the value is removed from the map.
         static void DisposeCallbackData(WeakCallbackDataType*);
         // This method is called if weakly referenced value is collected.
         static void DisposeWeak(const v8::WeakCallbackInfo<WeakCallbackDataType>&);
 
         static MapType* MapFromWeakCallbackInfo(const v8::WeakCallbackInfo<WeakCallbackDataType>&);
         static int KeyFromWeakCallbackInfo(const v8::WeakCallbackInfo<WeakCallbackDataType>&);
     };
 
     IdToPromiseMapTraits::MapType m_idToPromise;
 };
 
 } // namespace blink
 
 #endif // !defined(PromiseTracker_h)