Experiment with new function-type syntax.

pkg/compiler/lib/src/js_emitter/program_builder/field_visitor.dart

Index: pkg/compiler/lib/src/js_emitter/program_builder/field_visitor.dart
diff --git a/pkg/compiler/lib/src/js_emitter/program_builder/field_visitor.dart b/pkg/compiler/lib/src/js_emitter/program_builder/field_visitor.dart
index 1f6956d3c755dbababd052d7a876cba783e20392..9d55459e2f5a3037c837bf60d07ac83819b209a5 100644
--- a/pkg/compiler/lib/src/js_emitter/program_builder/field_visitor.dart
+++ b/pkg/compiler/lib/src/js_emitter/program_builder/field_visitor.dart
@@ -22,13 +22,13 @@ part of dart2js.js_emitter.program_builder;
  * case, [needsSetter] is always false. [needsCheckedSetter] is only true when
  * type assertions are enabled (checked mode).
  */
-typedef void AcceptField(
+typedef AcceptField = (
     VariableElement member,
     js.Name name,
     js.Name accessorName,
     bool needsGetter,
     bool needsSetter,
-    bool needsCheckedSetter);
+    bool needsCheckedSetter) -> void;
 
 class FieldVisitor {
   final Compiler compiler;