Oilpan: fix build after r182688.

Source/core/inspector/PromiseTracker.cpp

 // 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.
 
 #include "config.h"
 #include "core/inspector/PromiseTracker.h"
 
 #include "bindings/core/v8/ScopedPersistent.h"
 #include "bindings/core/v8/ScriptCallStackFactory.h"
 #include "bindings/core/v8/ScriptState.h"
@@ skipping 44 matching lines @@
         , m_promiseId(promiseId)
         , m_promise(scriptState->isolate(), promise)
         , m_parentPromiseId(0)
         , m_status(0)
 #if !ENABLE(OILPAN)
         , m_weakPtrFactory(this)
 #endif
     {
     }
 
-    RefPtrWillBeMember<ScriptState> m_scriptState;
+    RefPtr<ScriptState> m_scriptState;
     int m_promiseHash;
     int m_promiseId;
     ScopedPersistent<v8::Object> m_promise;
     int m_parentPromiseId;
     int m_status;
     RefPtrWillBeMember<ScriptCallStack> m_callStack;
     ScopedPersistent<v8::Object> m_parentPromise;
 #if !ENABLE(OILPAN)
     WeakPtrFactory<PromiseData> m_weakPtrFactory;
 #endif
@@ skipping 208 matching lines @@
                 ScriptState* scriptState = data->m_scriptState.get();
                 return ScriptValue(scriptState, data->m_promise.newLocal(scriptState->isolate()));
             }
         }
     }
 
     return ScriptValue();
 }
 
 } // namespace blink