Mojom parser: Fix snippet algorithm.

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 213f05e5629562ccbaef169a5f62bd44df94b933..5463c642e2bedb4d65e40d410d8b24c0ab7a7bbb 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 = "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";
+  var serializedRuntimeTypeInfo = "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";
 
   // Deserialize RuntimeTypeInfo
   var bytes = BASE64.decode(serializedRuntimeTypeInfo);