Mojom compiler frontend: Populate the declaration_order field for Methods.

mojo/dart/packages/_mojo_for_test_only/lib/dart_to_cpp/dart_to_cpp.mojom.dart

Index: mojo/dart/packages/_mojo_for_test_only/lib/dart_to_cpp/dart_to_cpp.mojom.dart
diff --git a/mojo/dart/packages/_mojo_for_test_only/lib/dart_to_cpp/dart_to_cpp.mojom.dart b/mojo/dart/packages/_mojo_for_test_only/lib/dart_to_cpp/dart_to_cpp.mojom.dart
index 6ce4364d2d1a4da5884bf86b76f234d267415b85..7a79c082405d8dc60f778dbc910ca6976b1097de 100644
--- a/mojo/dart/packages/_mojo_for_test_only/lib/dart_to_cpp/dart_to_cpp.mojom.dart
+++ b/mojo/dart/packages/_mojo_for_test_only/lib/dart_to_cpp/dart_to_cpp.mojom.dart
@@ -1331,7 +1331,7 @@ 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);