35   explicit TypedMessageData(const T& data) : data_(data) {}  in TypedMessageData()
36   const T& data() const { return data_; }  in data()  function
37   T& data() { return data_; }  in data()  function
47   explicit ScopedMessageData(std::unique_ptr<T> data)  in ScopedMessageData()
51   explicit ScopedMessageData(T* data) : data_(data) {}  in ScopedMessageData()
56   const std::unique_ptr<T>& data() const { return data_; }  in data()  function
57   std::unique_ptr<T>& data() { return data_; }  in data()  function
70   explicit ScopedRefMessageData(T* data) : data_(data) {}  in ScopedRefMessageData()
71   const scoped_refptr<T>& data() const { return data_; }  in data()  function
72   scoped_refptr<T>& data() { return data_; }  in data()  function
79 inline MessageData* WrapMessageData(const T& data) {  in WrapMessageData()
84 inline const T& UseMessageData(MessageData* data) {  in UseMessageData()
91   explicit DisposeData(T* data) : data_(data) {}  in DisposeData()