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

mojo/dart/packages/_mojo_for_test_only/lib/test/pingpong_service.mojom.dart

 // WARNING: DO NOT EDIT. This file was generated by a program.
 // See $MOJO_SDK/tools/bindings/mojom_bindings_generator.py.
 
 library pingpong_service_mojom;
 import 'dart:async';
 import 'dart:collection';
 import 'dart:convert';
 import 'dart:io';
 import 'dart:typed_data';
 import 'package:mojo/bindings.dart' as bindings;
@@ skipping 1240 matching lines @@
 
 Map<String, mojom_types.UserDefinedType> getAllMojomTypeDefinitions() {
   return getRuntimeTypeInfo().typeMap;
 }
 
 var _runtimeTypeInfo;
 mojom_types.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 = "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";
+  var serializedRuntimeTypeInfo = "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";
 
   // 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 = mojom_types.RuntimeTypeInfo.deserialize(message);
   return _runtimeTypeInfo;
 }