WTF: Make PassOwnPtr<T> move-only.

third_party/WebKit/public/platform/WebPrivateOwnPtr.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. 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.
@@ skipping 41 matching lines @@
     ~WebPrivateOwnPtr() { DCHECK(!m_ptr); }
 
     explicit WebPrivateOwnPtr(T* ptr)
         : m_ptr(ptr)
     {
     }
 
     T* get() const { return m_ptr; }
 
 #if INSIDE_BLINK
-    template<typename U> WebPrivateOwnPtr(const PassOwnPtr<U>&, EnsurePtrConvertibleArgDecl(U, T));
+    template <typename U>
+    WebPrivateOwnPtr(PassOwnPtr<U>, EnsurePtrConvertibleArgDecl(U, T));
 
     void reset(T* ptr)
     {
         delete m_ptr;
         m_ptr = ptr;
     }
 
-    void reset(const PassOwnPtr<T>& o)
+    void reset(PassOwnPtr<T> o)
     {
         reset(o.leakPtr());
     }
 
     PassOwnPtr<T> release()
     {
         T* ptr = m_ptr;
         m_ptr = nullptr;
         return adoptPtr(ptr);
     }
 
     T& operator*() const
     {
         DCHECK(m_ptr);
         return *m_ptr;
     }
 
     T* operator->() const
     {
         DCHECK(m_ptr);
         return m_ptr;
     }
 #endif // INSIDE_BLINK
 
 private:
     T* m_ptr;
 };
 
 #if INSIDE_BLINK
-template<typename T> template<typename U> inline WebPrivateOwnPtr<T>::WebPrivateOwnPtr(const PassOwnPtr<U>& o, EnsurePtrConvertibleArgDefn(U, T))
+template <typename T>
+template <typename U>
+inline WebPrivateOwnPtr<T>::WebPrivateOwnPtr(PassOwnPtr<U> o, EnsurePtrConvertibleArgDefn(U, T))
     : m_ptr(o.leakPtr())
 {
     static_assert(!std::is_array<T>::value, "Pointers to array must never be converted");
 }
 #endif
 
 } // namespace blink
 
 #endif