Mojo C++ bindings: switch the remaining callsites of the old serialization interface.

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

 {% from "enum_macros.tmpl" import enum_decl -%}
 
 class {{struct.name}} {
  public:
   using Data_ = internal::{{struct.name}}_Data;
   using Reader = {{struct.name}}_Reader;
 
 {#--- Enums #}
 {%- for enum in struct.enums -%}
   {{enum_decl(enum)|indent(2)}}
@@ skipping 41 matching lines @@
   }
 
 {#--- Struct members #}
 {%  for field in struct.fields %}
 {%-   set type = field.kind|cpp_wrapper_type %}
 {%-   set name = field.name %}
   {{type}} {{name}};
 {%- endfor %}
 };
 
-{# TODO(yzshen): Remove these wrappers of the Serializer interface. #}
-size_t GetSerializedSize_({{struct.name}}Ptr& input,
-                          mojo::internal::SerializationContext* context);
-void Serialize_({{struct.name}}Ptr input, mojo::internal::Buffer* buffer,
-                internal::{{struct.name}}_Data** output,
-                mojo::internal::SerializationContext* context);
-bool Deserialize_(internal::{{struct.name}}_Data* input,
-                  {{struct.name}}Ptr* output,
-                  mojo::internal::SerializationContext* context);
-
 {# TODO(yzshen): Redo the Reader interface. #}
 {# NOTE: Generated Reader instances are intentionally cheap to copy and devoid
    of heap allocations. They should stay this way. #}
 class {{struct.name}}_Reader {
  public:
   {{struct.name}}_Reader(internal::{{struct.name}}_Data* data,
                          mojo::internal::SerializationContext* context);
 
 {%-   for pf in struct.packed.packed_fields_in_ordinal_order %}
 {%-     set kind = pf.field.kind -%}
@@ skipping 23 matching lines @@
   }
 {%-     else %}
   {{kind|cpp_result_type}} {{name}}() const { return data_->{{name}}; }
 {%-     endif %}
 {%-   endfor %}
 
  private:
   internal::{{struct.name}}_Data* data_;
   mojo::internal::SerializationContext* context_;
 };