Add RawPtr constructor taking a reference argument.

Source/wtf/RawPtr.h

Index: Source/wtf/RawPtr.h
diff --git a/Source/wtf/RawPtr.h b/Source/wtf/RawPtr.h
index 146aaf3d5c639a2e402a4cad2ba0d6ada072cf80..953c363b85d23fb6c44d4a5434d73c6673cdb4e5 100644
--- a/Source/wtf/RawPtr.h
+++ b/Source/wtf/RawPtr.h
@@ -51,6 +51,7 @@ public:
     RawPtr() : m_ptr(0) { }
     RawPtr(std::nullptr_t) : m_ptr(0) { }
     RawPtr(T* ptr) : m_ptr(ptr) { }
+    RawPtr(T& reference) : m_ptr(&reference) { }

[Mikhail, 2014/03/05 06:33:43]

Shouldn't it be explicit? (to prevent from accidental deleting of a non-heap
allocated object)

     RawPtr(const RawPtr& other)
         : m_ptr(other.get())
     {