When reordering constructor initializers, use correct types for temp vars.

pkg/front_end/lib/src/fasta/source/diet_listener.dart

Index: pkg/front_end/lib/src/fasta/source/diet_listener.dart
diff --git a/pkg/front_end/lib/src/fasta/source/diet_listener.dart b/pkg/front_end/lib/src/fasta/source/diet_listener.dart
index 31d4daa38e094325d76082a9726969dc28880dcb..e4ecf54f6b58b189e4877ec8ee533a09b0235fad 100644
--- a/pkg/front_end/lib/src/fasta/source/diet_listener.dart
+++ b/pkg/front_end/lib/src/fasta/source/diet_listener.dart
@@ -36,8 +36,6 @@ import '../type_inference/type_inference_engine.dart' show TypeInferenceEngine;
 import '../type_inference/type_inference_listener.dart'
     show TypeInferenceListener;
 
-import '../type_inference/type_inferrer.dart' show TypeInferrerDisabled;
-
 import '../util/link.dart' show Link;
 
 import 'source_library_builder.dart' show SourceLibraryBuilder;
@@ -434,7 +432,7 @@ class DietListener extends StackListener {
       thisType = cls.thisType;
     }
     var typeInferrer = library.disableTypeInference
-        ? new TypeInferrerDisabled()
+        ? typeInferenceEngine.createDisabledTypeInferrer()
         : typeInferenceEngine.createLocalTypeInferrer(uri, listener, thisType);
     return new BodyBuilder(library, builder, memberScope, formalParameterScope,
         hierarchy, coreTypes, currentClass, isInstanceMember, uri, typeInferrer)