Mojom compiler frontend: Populate the declaration_order field for Methods.

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

Index: mojo/dart/packages/_mojo_for_test_only/lib/sample/sample_interfaces.mojom.dart
diff --git a/mojo/dart/packages/_mojo_for_test_only/lib/sample/sample_interfaces.mojom.dart b/mojo/dart/packages/_mojo_for_test_only/lib/sample/sample_interfaces.mojom.dart
index 328b0da42b7dbc0a632e6c83ed43e38d99e43761..5332c42efc92fcaf1fd52cd0e3b75d07e05233da 100644
--- a/mojo/dart/packages/_mojo_for_test_only/lib/sample/sample_interfaces.mojom.dart
+++ b/mojo/dart/packages/_mojo_for_test_only/lib/sample/sample_interfaces.mojom.dart
@@ -2332,7 +2332,7 @@ 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);