Rename the inner function of async functions.

tests/compiler/dart2js/async_await_js_transform_test.dart

Index: tests/compiler/dart2js/async_await_js_transform_test.dart
diff --git a/tests/compiler/dart2js/async_await_js_transform_test.dart b/tests/compiler/dart2js/async_await_js_transform_test.dart
index 36aa10d6e272ed6fe96f4584150d46a0e2d0f7de..f1f2d324d764d5774860c3595bda8b0cd5f1ccf9 100644
--- a/tests/compiler/dart2js/async_await_js_transform_test.dart
+++ b/tests/compiler/dart2js/async_await_js_transform_test.dart
@@ -15,7 +15,8 @@ void testTransform(String source, String expected) {
       null,
       asyncHelper: new VariableUse("thenHelper"),
       newCompleter: new VariableUse("Completer"),
-      safeVariableName: (String name) => "__$name").rewrite(fun);
+      safeVariableName: (String name) => "__$name",
+      bodyName: "body").rewrite(fun);
 
   JavaScriptPrintingOptions options = new JavaScriptPrintingOptions();
   SimpleJavaScriptPrintingContext context =