Mojo C++ bindings templates: use the same templates for user-defined structs and method params.

mojo/public/tools/bindings/generators/cpp_templates/module.cc.tmpl

Index: mojo/public/tools/bindings/generators/cpp_templates/module.cc.tmpl
diff --git a/mojo/public/tools/bindings/generators/cpp_templates/module.cc.tmpl b/mojo/public/tools/bindings/generators/cpp_templates/module.cc.tmpl
index 863d18fe4bb8e13082a31e2ff04ace901c551446..969bea2f58d922220a61ab9c84f84d645a314616 100644
--- a/mojo/public/tools/bindings/generators/cpp_templates/module.cc.tmpl
+++ b/mojo/public/tools/bindings/generators/cpp_templates/module.cc.tmpl
@@ -47,10 +47,12 @@ namespace {
 {%-     set method_name = "k%s_%s_Name"|format(interface.name, method.name) %}
 const uint32_t {{method_name}} = {{method.ordinal}};
 {%      set struct = method|struct_from_method %}
-{%-     include "params_definition.tmpl" %}
+{%      include "struct_declaration.tmpl" %}
+{%-     include "struct_definition.tmpl" %}
 {%-     if method.response_parameters != None %}
 {%-       set struct = method|response_struct_from_method %}
-{%-       include "params_definition.tmpl" %}
+{%        include "struct_declaration.tmpl" %}
+{%-       include "struct_definition.tmpl" %}
 {%-     endif %}
 {%-   endfor %}
 {%- endfor %}