Make the fuchsia mojo/public repo the source of truth.

mojo/public/tools/bindings/generators/dart_templates/module_definition.tmpl

-{#--- Constants #}
-{%-  for constant in module.constants %}
-const {{constant.kind|dart_type}} {{constant|name}} = {{constant.resolved_value}};
-{%- endfor %}
-
-{#--- Enums #}
-{%- from "enum_definition.tmpl" import enum_def %}
-{%- for enum in enums %}
-{{ enum_def(enum, typepkg, package) }}
-{%-  endfor %}
-
-{#--- Struct definitions #}
-{%- from "struct_definition.tmpl" import struct_def %}
-{%  for struct in structs %}
-{{ struct_def(struct, typepkg, package) }}
-{%- endfor -%}
-
-{#--- Union definitions #}
-{%- from "union_definition.tmpl" import union_def %}
-{%  for union in unions %}
-{{ union_def(union, typepkg, package) }}
-{%- endfor -%}
-
-{#--- Interface definitions #}
-{%- for interface in interfaces -%}
-{%-   include "interface_definition.tmpl" %}
-{%- endfor %}
-
-{% if should_gen_mojom_types -%}
-{{typepkg}}RuntimeTypeInfo getRuntimeTypeInfo() => _runtimeTypeInfo ??
-    _initRuntimeTypeInfo();
-
-Map<String, {{typepkg}}UserDefinedType> getAllMojomTypeDefinitions() {
-  return getRuntimeTypeInfo().typeMap;
-}
-
-var _runtimeTypeInfo;
-{{typepkg}}RuntimeTypeInfo  _initRuntimeTypeInfo() {
-  // serializedRuntimeTypeInfo contains the bytes of the Mojo serialization of
-  // a mojom_types.RuntimeTypeInfo struct describing the Mojom types in this
-  // file. The string contains the base64 encoding of the gzip-compressed bytes.
-  var serializedRuntimeTypeInfo = "{{module.serialized_runtime_type_info}}";
-
-  // Deserialize RuntimeTypeInfo
-  var bytes = BASE64.decode(serializedRuntimeTypeInfo);
-  var unzippedBytes = new ZLibDecoder().convert(bytes);
-  var bdata = new ByteData.view(unzippedBytes.buffer);
-  var message = new bindings.Message(bdata, null, unzippedBytes.length, 0);
-  _runtimeTypeInfo = {{typepkg}}RuntimeTypeInfo.deserialize(message);
-
-{%- for import in imports %}
-  {{import.unique_name}}.getAllMojomTypeDefinitions()
-      .forEach((String s, {{typepkg}}UserDefinedType udt) {
-          _runtimeTypeInfo.typeMap[s] = udt;
-      });
-{% endfor %}
-  return _runtimeTypeInfo;
-}
-
-{%- endif %}