Prepare for move-only PassOwnPtr in the remaining directories.

third_party/WebKit/Source/wtf/Functional.h

 /*
  * Copyright (C) 2011 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 141 matching lines @@
     {
     }
 
     template <typename... IncomingParameters>
     R operator()(C* c, IncomingParameters&&... parameters)
     {
         return (c->*m_function)(std::forward<IncomingParameters>(parameters)...);
     }
 
     template <typename... IncomingParameters>
-    R operator()(PassOwnPtr<C> c, IncomingParameters&&... parameters)
+    R operator()(const PassOwnPtr<C>& c, IncomingParameters&&... parameters)
     {
         return (c.get()->*m_function)(std::forward<IncomingParameters>(parameters)...);
     }
 
     template <typename... IncomingParameters>
     R operator()(const WeakPtr<C>& c, IncomingParameters&&... parameters)
     {
         C* obj = c.get();
         if (!obj)
             return R();
@@ skipping 171 matching lines @@
 
 } // namespace WTF
 
 using WTF::passed;
 using WTF::Function;
 using WTF::bind;
 using WTF::SameThreadClosure;
 using WTF::CrossThreadClosure;
 
 #endif // WTF_Functional_h