WTF: Make PassOwnPtr<T> move-only.

third_party/WebKit/public/platform/WebPrivateOwnPtr.h

Index: third_party/WebKit/public/platform/WebPrivateOwnPtr.h
diff --git a/third_party/WebKit/public/platform/WebPrivateOwnPtr.h b/third_party/WebKit/public/platform/WebPrivateOwnPtr.h
index 060a6217fdc24b98880347f175e70d81f3aaad0e..64d0451f9362e4a07544f0ef8c703fd63f44820f 100644
--- a/third_party/WebKit/public/platform/WebPrivateOwnPtr.h
+++ b/third_party/WebKit/public/platform/WebPrivateOwnPtr.h
@@ -59,7 +59,8 @@ public:
     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)
     {
@@ -67,7 +68,7 @@ public:
         m_ptr = ptr;
     }
 
-    void reset(const PassOwnPtr<T>& o)
+    void reset(PassOwnPtr<T> o)
     {
         reset(o.leakPtr());
     }
@@ -97,7 +98,9 @@ private:
 };
 
 #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");