Oilpan: have LifetimeNotifier<T> track its observers weakly.

Source/bindings/core/v8/ScriptPromiseResolver.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 ScriptPromiseResolver_h
 #define ScriptPromiseResolver_h
 
 #include "bindings/core/v8/ScopedPersistent.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptState.h"
@@ skipping 99 matching lines @@
 #if ENABLE(ASSERT)
     void assertNotPending()
     {
         // This assertion fails if:
         //  - promise() is called at least once and
         //  - this resolver is destructed before it is resolved, rejected or
         //    the associated ExecutionContext is stopped.
         // This function cannot be run in the destructor if
         // ScriptPromiseResolver is on-heap.
         ASSERT(m_state == ResolvedOrRejected || !m_isPromiseCalled || !executionContext() || executionContext()->activeDOMObjectsAreStopped());
-
-#if ENABLE(OILPAN)
-        // Delegate to LifecycleObserver's prefinalizer.
-        LifecycleObserver::dispose();
-#endif
     }
 #endif
 
     template<typename T>
     void resolveOrReject(T value, ResolutionState newState)
     {
         if (m_state != Pending || !executionContext() || executionContext()->activeDOMObjectsAreStopped())
             return;
         ASSERT(newState == Resolving || newState == Rejecting);
         m_state = newState;
@@ skipping 21 matching lines @@
     ScopedPersistent<v8::Value> m_value;
 #if ENABLE(ASSERT)
     // True if promise() is called.
     bool m_isPromiseCalled;
 #endif
 };
 
 } // namespace blink
 
 #endif // ScriptPromiseResolver_h