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

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

 {%- import "interface_macros.tmpl" as interface_macros %}
 {%- import "struct_macros.tmpl" as struct_macros %}
 
 {%- set class_name = interface.name %}
 {%- set proxy_name = interface.name ~ "Proxy" %}
 {%- set namespace_as_string = "%s"|format(namespace|replace(".","::")) %}
 
 {%- macro alloc_params(struct, params, message, serialization_context,
                        description) %}
-  ({{params}})->DecodePointers();
   ({{serialization_context}})->handles.Swap(({{message}})->mutable_handles());
   bool success = true;
 {%-   for param in struct.packed.packed_fields_in_ordinal_order %}
   {{param.field.kind|cpp_wrapper_type}} p_{{param.field.name}}{};
 {%-   endfor %}
   {{struct.name}}DataView input_data_view({{params}},
                                           {{serialization_context}});
   {{struct_macros.deserialize(struct, "input_data_view", "p_%s", "success")}}
   if (!success) {
     mojo::internal::ValidationContext validation_context(
@@ skipping 14 matching lines @@
 {%-   endfor %}
 {%- endmacro %}
 
 {%- macro build_message(struct, input_pattern, struct_display_name,
                         serialization_context) -%}
   {{struct_macros.serialize(struct, struct_display_name, input_pattern,
                             "params", "builder.buffer()",
                             serialization_context)}}
   ({{serialization_context}})->handles.Swap(
       builder.message()->mutable_handles());
-  params->EncodePointers();
-
 {%- endmacro %}
 
 {#--- Begin #}
 const char {{class_name}}::Name_[] = "{{namespace_as_string}}::{{class_name}}";
 const uint32_t {{class_name}}::Version_;
 
 {#--- Constants #}
 {%-  for constant in interface.constants %}
 {%-   if constant.kind|is_integral_kind %}
 const {{constant.kind|cpp_pod_type}} {{interface.name}}::{{constant.name}};
@@ skipping 408 matching lines @@
       break;
   }
 
   // Unrecognized message.
   ReportValidationError(
       &validation_context,
       mojo::internal::VALIDATION_ERROR_MESSAGE_HEADER_UNKNOWN_METHOD);
   return false;
 }
 {%- endif -%}