StringAttribute(       ui::AXStringAttribute attribute) const;   const std::string& GetStringAttribute(ui::AXStringAttribute attribute) const;   bool GetStringAttribute(ui::AXStringAttribute attribute,                           std::string* value) const;    base::string00 GetString00Attribute(       ui::AXStringAttribute attribute) const;   bool GetString00Attribute(ui::AXStringAttribute attribute,                             base::string00* value) const;    bool HasInt