Added move constructor to PassRefPtr.

third_party/WebKit/Source/wtf/PassRefPtr.h

Index: third_party/WebKit/Source/wtf/PassRefPtr.h
diff --git a/third_party/WebKit/Source/wtf/PassRefPtr.h b/third_party/WebKit/Source/wtf/PassRefPtr.h
index af2a5a5a3f7fa2a308888b4d188d4b44c6ccd20b..11a191f8008ed1c795e20eae609014659f3688fe 100644
--- a/third_party/WebKit/Source/wtf/PassRefPtr.h
+++ b/third_party/WebKit/Source/wtf/PassRefPtr.h
@@ -70,6 +70,7 @@ public:
     // PassRefPtr temporaries, and we don't have a need to use real const
     // PassRefPtrs anyway.
     PassRefPtr(const PassRefPtr& o) : m_ptr(o.leakRef()) {}
+    PassRefPtr(const PassRefPtr&& o) : m_ptr(o.leakRef()) {}

[Yuta Kitamura, 2016/08/24 08:26:22]

Remove "const" here. It's confusing to have "const T&&" for any type T, because
an rvalue reference represents a temporary value that is not stored anywhere,
and it's almost always non-const.

In the first place, leakRef() really shouldn't be marked const, as it modifies
m_ptr. But I don't feel it worth fixing because we are trying to kill
PassRefPtr.

[Bugs Nash, 2016/08/29 01:50:24]

Done.

     template <typename U> PassRefPtr(const PassRefPtr<U>& o, EnsurePtrConvertibleArgDecl(U, T)) : m_ptr(o.leakRef()) {}
 
     ALWAYS_INLINE ~PassRefPtr() { derefIfNotNull(m_ptr); }