Update Dart bindings for _mojo_for_test_only package.

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

Index: mojo/dart/packages/_mojo_for_test_only/lib/test/pingpong_service.mojom.dart
diff --git a/mojo/dart/packages/_mojo_for_test_only/lib/test/pingpong_service.mojom.dart b/mojo/dart/packages/_mojo_for_test_only/lib/test/pingpong_service.mojom.dart
index d9a8e266610296a9e7e6af3e177163934f4a5232..213f05e5629562ccbaef169a5f62bd44df94b933 100644
--- a/mojo/dart/packages/_mojo_for_test_only/lib/test/pingpong_service.mojom.dart
+++ b/mojo/dart/packages/_mojo_for_test_only/lib/test/pingpong_service.mojom.dart
@@ -1231,7 +1231,7 @@ 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 = "H4sIAAAJbogC/+xZT1PTQBRPUsAKlj8KUgGhKjpcJMzogeHEjDIedJwqOAPjATN1xWibxCTl4MmjH4GP4Efgo3js0SNHb7pL3up2s69/ME2Cw848wm6b3f29fe/93r6WtahNwvMbPOXxdaGvUylC/yaVGSohCcKNjartHFRd52Cb+Id2jSi+L8+7Bs+7MNfOXnVr/+nW3gabcDU+HzaPJ4wbivmXqSyg8z+q28QJ+9nHirBOQdoP638ZivorMF7RpKa3dzelj9ek8V/Qqpq6XacyTkVGNE/HrsH5KODG9LhIZZTKayrbVMz3boOY1mfLsc2G+8E1A78W/fPW8kPT8jw2c2Cyv/u0F5i2ExL/nVUjgenR9Ty63n4Q6W2VvdhQrsv7VyTVyPYj67OF6APTpybpcwV5n+2DHSFTl2q/S3D+g9ZTRdIPx/tT7w/nGoJzGrAynPd98qlJ96fCy9ug8crnvamIP5rwebfWi35U47xdBX843e6hVW8SdfxZAv9LWz9lKaRMIn7igb18ReIO1++RxAPcfo4R/cj7qSji8yVhnMWiMaajCNlzq0F64pFZKhNCfOOfLIANI2E6dk7FlOJbNzzyvsTzGhHO0wA+YbFoGM5pRLDX40L0/A4v7ZbgXKdhfFZtDz/+MW5i/jJF5fLp+YYCy8TxjmYUPznuXaM/vOsI3huA+Q9eMYjmPI4yezpJOI5ifDoOdlsDo1DZw3yK9qBJ61e65FG95o9njc8tJD1MLI+x1XlM6X/LY+yLPKZjHmN3zmNKOc9jePxeh/uVkRBvzQB2Zj87ln9Awlcvnyn0M5Uxb5ULyfAWz0/a8AqOk5XfyPf3io77j54if41BHtb060q/mYIcNQ2/6ZS/d4srxTPoRe+glxLkETW36YSIXu5kHE8MoY/5Vb88hPnVIuQQsl8FdN8ByT8faSn5E8//3Y8a6k8PcsxDPO4cAQ8VtGTvE3/tR7jMKvQ0kxEfcfxen3y0ieC+BdhjuHNyn5J5ydPzca+agPoK7FhpH8s5uFdh9Zte6+155zmm54c55rkT8UsJ+OttKnOIv3KuOw/3r7zwHbOfx+eA73gbSojv5uBu+oSEiuqt+neiLPnuTcL+E8fdTngX9cPeeI7176VoF8aAeC6p+uFwwvXDF01bWU+bz7h+2NKSrR8ynHmoHxaR39fKSJ7zOwAA//88i19VyCEAAA==";
+  var serializedRuntimeTypeInfo = "H4sIAAAJbogC/+xZzVITTxDf3QD//MHwoSAREKKixUWWKj1QnFKllActKyqWcIprHFOrSXbZD84efQQewUfgUTzm6JGjN50hPTqZnc4HbnYXi6lqlpndnZ1fT3f/ejpFrdNm4foVrvL4ttDXqeShf5PKApWA+MHOTsVu1StOq/6KeEd2jSiel+fdgutdmGvvoLJbfbp7sMMm3IzOh83jCuOGYv51Kivo/I8aNmkFw6xjQ/hOTloP638e6/Q3YLykSU3v7pal21vS+E9oFU3drlOZpiIjWqZj12B/FHAjelylMkmlSuUNFfOdHfhmEHqHoWP7xGw6Hx3T92qdf95bXmBarstmp0/Rv1Xa8027FRDvg1UjvunSb7r0m1W/o7tN9mIz8l3evyKpRrYfWZ9tRB+YPjVJnxvI+2wdbAuZulR6WoP9H7WeSpJ+ON4f+nA4txCc84CV4bzvkcOQrk2Fl7dR45X3u6yIP5pwv18bRD+qcd6ugj+cLfXIaoREHX/WwP+S1k9RCimziJ+4YC9fkLjD9Xss8QC3nxNEP/J6Sor4/J8wzmLRFBWIpM+tJhmIRxapzAjxjd9ZARtGwnRkn/IJxbd+eOR1ifs1IeynAXzCYtE47NOEYK8nuc71G7y0X4B9nYfxRbU9fP/LuIn5yxyV/8/2NxBYJop3MqX4yXHvG8Ph3Ubw3gDMv/GKQTTjcZTZ02nMcRTj02mw2xoYhcoelhO0B036fqlPHjVo/nje+NxG0sPY8hhbnccU/rU8xr7MY3rmMXbvPKaQ8TyGx+9tOF8ZMfHWAmBn9rNneXUSvH75TKGfuZR5q5iLh7d4ftKFV3CctPxGPr+XdNx/9AT5awrysNBrKP1mDnLUJPymV/7eL67kz6EXvYdeCpBH1JywFSB6uZNyPDGEPuZXw/IQ5lerkEPIfuXTNfsk+3ykJeRPPP93PmmoPz3IMA/xuHMMPJTT4j1P/LEf4TCr0NNCSnzE8btD8lEZwX0LsEdwZ+Q8JfOSq2fjXDUD9RVYrdI+1jNwrsLqN4PW27POc0zPDzPMc6fiQzH4620qS4i/cq67COevrPAds5/HF4DveBuLie+W4Gz6hASK6q2m/J0oTb57G7P/RHF3E95l/XAwnmP9ewnahTEinourfjgec/3wRWgr62nLKdcP21q89UOGMwv1wzzy+1oRyXN+BQAA///Lyk8IyCEAAA==";
 
   // Deserialize RuntimeTypeInfo
   var bytes = BASE64.decode(serializedRuntimeTypeInfo);