Mojom parser: Fix snippet algorithm.

mojo/dart/packages/_mojo_for_test_only/lib/sample/sample_factory.mojom.dart

Index: mojo/dart/packages/_mojo_for_test_only/lib/sample/sample_factory.mojom.dart
diff --git a/mojo/dart/packages/_mojo_for_test_only/lib/sample/sample_factory.mojom.dart b/mojo/dart/packages/_mojo_for_test_only/lib/sample/sample_factory.mojom.dart
index 312c090e280e5b15c45b76413bf2c497b0be3c75..708f8864c54e88eb21af82ace3ef8981ec734df5 100644
--- a/mojo/dart/packages/_mojo_for_test_only/lib/sample/sample_factory.mojom.dart
+++ b/mojo/dart/packages/_mojo_for_test_only/lib/sample/sample_factory.mojom.dart
@@ -1764,7 +1764,7 @@ 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);