Made conversions from PassRefPtr to WebPrivatePtr move only.

third_party/WebKit/public/platform/WebPrivatePtr.h

 /*
  * Copyright (C) 2010 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 79 matching lines @@
 template <typename T,
           WebPrivatePtrDestruction crossThreadDestruction,
           WebPrivatePtrStrength strongOrWeak>
 class PtrStorageImpl<T,
                      crossThreadDestruction,
                      strongOrWeak,
                      kRefCountedLifetime> {
  public:
   typedef PassRefPtr<T> BlinkPtrType;
 
-  void Assign(const BlinkPtrType& val) {
+  void Assign(BlinkPtrType&& val) {
     static_assert(
         crossThreadDestruction == kWebPrivatePtrDestructionSameThread ||
             WTF::IsSubclassOfTemplate<T, WTF::ThreadSafeRefCounted>::value,
         "Cross thread destructible class must derive from "
         "ThreadSafeRefCounted<>");
     static_assert(
         strongOrWeak == WebPrivatePtrStrength::kNormal,
         "Ref-counted classes do not support weak WebPrivatePtr<> references");
     Release();
     ptr_ = val.LeakRef();
@@ skipping 167 matching lines @@
     // want to expose destructors of core classes to embedders. We should
     // call reset() manually in destructors of classes with WebPrivatePtr
     // members.
     DCHECK(!storage_);
   }
 
   bool IsNull() const { return !storage_; }
 
 #if INSIDE_BLINK
   template <typename U>
-  WebPrivatePtr(const U& ptr) : storage_(0) {
-    Storage().Assign(ptr);
+  WebPrivatePtr(U&& ptr) : storage_(0) {
+    Storage().Assign(std::forward<U>(ptr));
   }
 
   void Reset() { Storage().Release(); }
 
   WebPrivatePtr& operator=(const WebPrivatePtr& other) {
     Storage().Assign(other.Storage());
     return *this;
   }
 
   template <typename U>
-  WebPrivatePtr& operator=(const U& ptr) {
-    Storage().Assign(ptr);
+  WebPrivatePtr& operator=(U&& ptr) {
+    Storage().Assign(std::forward<U>(ptr));
     return *this;
   }
 
   T* Get() const { return Storage().Get(); }
 
   T& operator*() const {
     DCHECK(storage_);
     return *Get();
   }
 
@@ skipping 23 matching lines @@
   // Disable the copy constructor; classes that contain a WebPrivatePtr
   // should implement their copy constructor using assign().
   WebPrivatePtr(const WebPrivatePtr&) = delete;
 
   void* storage_;
 };
 
 }  // namespace blink
 
 #endif  // WebPrivatePtr_h