Mojo C++ bindings: Merge EncodePointers/DecodePointers into Serialize/Deserialize, respectively.

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

 {%- import "validation_macros.tmpl" as validation_macros %}
 {%- set class_name = union.name ~ "_Data" %}
 {%- set enum_name = union.name ~ "_Tag" -%}
 
 // static
 {{class_name}}* {{class_name}}::New(mojo::internal::Buffer* buf) {
   return new (buf->Allocate(sizeof({{class_name}}))) {{class_name}}();
 }
 
 // static
@@ skipping 30 matching lines @@
 
 void {{class_name}}::set_null() {
   size = 0U;
   tag = static_cast<{{enum_name}}>(0);
   data.unknown = 0U;
 }
 
 {{class_name}}::{{class_name}}() {
 }
 
-void {{class_name}}::EncodePointers() {
-  switch (tag) {
-{%- for field in union.fields %}
-    case {{enum_name}}::{{field.name|upper}}: {
-{%-   if field.kind|is_object_kind %}
-      mojo::internal::Encode(&data.f_{{field.name}});
-{%-   endif %}
-      return;
-    }
-{%- endfor %}
-  }
-}
-
-void {{class_name}}::DecodePointers() {
-  switch (tag) {
-{%- for field in union.fields %}
-    case {{enum_name}}::{{field.name|upper}}: {
-{%-   if field.kind|is_object_kind %}
-      mojo::internal::Decode(&data.f_{{field.name}});
-{%-   endif %}
-      return;
-    }
-{%- endfor %}
-  }
-}