Oilpan: fix build after r187362.

Source/core/inspector/AsyncCallStackTracker.cpp

 /*
  * Copyright (C) 2013 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 91 matching lines @@
     }
 
     PassRefPtrWillBeRawPtr<AsyncCallChain> get(typename MapType::KeyPeekInType key) const
     {
         return m_asyncCallChains.get(key);
     }
 
     void remove(typename MapType::KeyPeekInType key)
     {
         ASSERT(m_tracker);
-        RefPtr<AsyncCallChain> chain = m_asyncCallChains.take(key);
+        RefPtrWillBeRawPtr<AsyncCallChain> chain = m_asyncCallChains.take(key);
         if (chain)
             m_tracker->m_debuggerAgent->didCompleteAsyncOperation(chain.get());
     }
 
     void trace(Visitor* visitor)
     {
         visitor->trace(m_tracker);
         visitor->trace(m_asyncCallChains);
     }
 
@@ skipping 416 matching lines @@
 }
 
 void AsyncCallStackTracker::trace(Visitor* visitor)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_executionContextDataMap);
 #endif
 }
 
 } // namespace blink