Mojo: Correctly handle large unsigned integer literals.

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

 {%- import "interface_macros.tmpl" as interface_macros %}
 {%- set class_name = interface.name %}
 {%- set proxy_name = interface.name ~ "Proxy" %}
 {%- set namespace_as_string = "%s"|format(namespace|replace(".","::")) %}
 
 {%- macro alloc_params(parameters) %}
 {%-   for param in parameters %}
 {%-     if param.kind|is_object_kind  %}
 {{param.kind|cpp_result_type}} p{{loop.index}};
 Deserialize_(params->{{param.name}}.ptr, &p{{loop.index}});
@@ skipping 58 matching lines @@
 {%-   endfor %}
   mojo::Message message;
   params->EncodePointersAndHandles(message.mutable_handles());
   builder.Finish(&message);
 {%- endmacro %}
 
 {#--- Begin #}
 const char* {{class_name}}::Name_ = "{{namespace_as_string}}::{{class_name}}";
 {#--- Constants #}
 {%  for constant in interface.constants %}
-const {{constant.kind|cpp_pod_type}} {{interface.name}}::{{constant.name}} = {{constant.value|expression_to_text}};
+const {{constant.kind|cpp_pod_type}} {{interface.name}}::{{constant.name}} = {{constant|constant_value}};
 {%- endfor %}
 
 {#--- ForwardToCallback definition #}
 {%- for method in interface.methods -%}
 {%-   if method.response_parameters != None %}
 class {{class_name}}_{{method.name}}_ForwardToCallback
     : public mojo::MessageReceiver {
  public:
   {{class_name}}_{{method.name}}_ForwardToCallback(
       const {{interface_macros.declare_callback(method)}}& callback)
@@ skipping 216 matching lines @@
       }
       break;
     }
 {%-   endfor %}
   }
 {%- endif %}
 
   return sink_->Accept(message);
 }
 {%- endif -%}