Mojo: more idiomatic C++ bindings

mojo/public/tools/bindings/generators/cpp_templates/struct_declaration.tmpl

 {%- import "struct_macros.tmpl" as struct_macros %}
 {%- set class_name = struct.name ~ "_Data" -%}
 
 class {{class_name}} {
  public:
-  typedef {{struct.name}} Wrapper;
+  static {{class_name}}* New(mojo::internal::Buffer* buf);
 
-  static {{class_name}}* New(mojo::Buffer* buf, mojo::Buffer::Destructor dtor = NULL);
+  mojo::internal::StructHeader header_;
+{{struct_macros.fields(struct)}}
 
-{#--- Setters -#}
-{{ struct_macros.setters(struct) }}
-
-{#--- Getters -#}
-{{ struct_macros.getters(struct) }}
-
-  size_t ComputeSize() const;
-  {{class_name}}* Clone(mojo::Buffer* buf) const;
-  void CloseHandles();
   void EncodePointersAndHandles(std::vector<mojo::Handle>* handles);
   bool DecodePointersAndHandles(mojo::Message* message);
 
  private:
   {{class_name}}();
   ~{{class_name}}();  // NOT IMPLEMENTED
-
-  mojo::internal::StructHeader _header_;
-{{ struct_macros.fields(struct) }}
 };
 MOJO_COMPILE_ASSERT(sizeof({{class_name}}) == {{struct.packed|struct_size}},
                     bad_sizeof_{{class_name}});