Remove return in visitInitializers.

tests/compiler/dart2js/semantic_visitor_test.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.semantics_visitor_test;
 
 import 'dart:async';
 import 'dart:mirrors';
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
@@ skipping 3448 matching lines @@
               element: 'parameter(#b)',
               index: 1),
           const Visit(VisitKind.VISIT_FIELD_INITIALIZER,
               element: 'field(C#field)',
               rhs: 'a'),
         ],
         method: ''),
     const Test.clazz(
         '''
         class C {
+          var field1;
+          var field2;
+          C(a, b) : this.field1 = a, this.field2 = b;
+        }
+        ''',
+        const [
+          const Visit(VisitKind.VISIT_GENERATIVE_CONSTRUCTOR_DECL,
+              element: 'generative_constructor(C#)',
+              parameters: '(a,b)',
+              body: ';'),
+          const Visit(VisitKind.VISIT_REQUIRED_PARAMETER_DECL,
+              element: 'parameter(#a)',
+              index: 0),
+          const Visit(VisitKind.VISIT_REQUIRED_PARAMETER_DECL,
+              element: 'parameter(#b)',
+              index: 1),
+          const Visit(VisitKind.VISIT_FIELD_INITIALIZER,
+              element: 'field(C#field1)',
+              rhs: 'a'),
+          const Visit(VisitKind.VISIT_FIELD_INITIALIZER,
+              element: 'field(C#field2)',
+              rhs: 'b'),
+        ],
+        method: ''),
+    const Test.clazz(
+        '''
+        class C {
           C(a, b) : this._(a, b);
           C._(a, b);
         }
         ''',
         const [
           const Visit(VisitKind.VISIT_REDIRECTING_GENERATIVE_CONSTRUCTOR_DECL,
               element: 'generative_constructor(C#)',
               parameters: '(a,b)',
               initializers: ':this._(a,b)'),
           const Visit(VisitKind.VISIT_REQUIRED_PARAMETER_DECL,
@@ skipping 3907 matching lines @@
   VISIT_REQUIRED_INITIALIZING_FORMAL_DECL,
   VISIT_OPTIONAL_INITIALIZING_FORMAL_DECL,
   VISIT_NAMED_INITIALIZING_FORMAL_DECL,
 
   VISIT_UNRESOLVED_COMPOUND,
   VISIT_UNRESOLVED_PREFIX,
   VISIT_UNRESOLVED_POSTFIX,
 
   // TODO(johnniwinther): Add tests for more error cases.
 }