Mojom parser: Fix snippet algorithm.

mojo/dart/packages/_mojo_for_test_only/lib/imported/sample_import.mojom.dart

Index: mojo/dart/packages/_mojo_for_test_only/lib/imported/sample_import.mojom.dart
diff --git a/mojo/dart/packages/_mojo_for_test_only/lib/imported/sample_import.mojom.dart b/mojo/dart/packages/_mojo_for_test_only/lib/imported/sample_import.mojom.dart
index 7b4fd3065e68bd858574e23088f5052b12dca2ca..9a6ee9151ad32b3df688465c7a7a7315b4b88d0f 100644
--- a/mojo/dart/packages/_mojo_for_test_only/lib/imported/sample_import.mojom.dart
+++ b/mojo/dart/packages/_mojo_for_test_only/lib/imported/sample_import.mojom.dart
@@ -542,7 +542,7 @@ 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);