Fix dart2dart new_backend

pkg/compiler/lib/src/dart_backend/backend_ast_to_frontend_ast.dart

Index: pkg/compiler/lib/src/dart_backend/backend_ast_to_frontend_ast.dart
diff --git a/pkg/compiler/lib/src/dart_backend/backend_ast_to_frontend_ast.dart b/pkg/compiler/lib/src/dart_backend/backend_ast_to_frontend_ast.dart
index 8398cbbdb8ad0ab63e102454b5940874c06a4ac8..7c8113a26352b6a03ffbd573b6188983b8909ad7 100644
--- a/pkg/compiler/lib/src/dart_backend/backend_ast_to_frontend_ast.dart
+++ b/pkg/compiler/lib/src/dart_backend/backend_ast_to_frontend_ast.dart
@@ -976,17 +976,16 @@ class TreePrinter {
         setElement(definition, param.element, param);
       }
       if (param.defaultValue != null) {
-        return new tree.SendSet(
+        definition = new tree.SendSet(

[Johnni Winther, 2015/03/05 10:48:01]

This fixes a crash in language/issue13179_test

             null,
             definition,
             new tree.Operator(assignOperator),
             singleton(makeExpression(param.defaultValue)));
-      } else {
-        return new tree.VariableDefinitions(
-            null,
-            makeEmptyModifiers(),
-            singleton(definition));
       }
+      return new tree.VariableDefinitions(
+          null,
+          makeEmptyModifiers(),
+          singleton(definition));
     } else {
       tree.Node definition;
       if (param.defaultValue != null) {