[Effen] remove some redundant styles

sky/framework/components/menu_item.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import '../fn.dart';
 import 'button_base.dart';
 import 'icon.dart';
 import 'ink_well.dart';
 
 class MenuItem extends ButtonBase {
   static final Style _style = new Style('''
-    transform: translateX(0);
-    display: flex;
-    flex-direction: row;
     align-items: center;
     height: 48px;
     -webkit-user-select: none;'''
   );
 
   static final Style _highlightStyle = new Style('''
-    transform: translateX(0);
-    display: flex;
-    flex-direction: row;
     align-items: center;
     height: 48px;
     background: rgba(153, 153, 153, 0.4);
     -webkit-user-select: none;'''
   );
 
   static final Style _iconStyle = new Style('''
     padding: 0px 16px;'''
   );
 
@@ skipping 21 matching lines @@
           new Container(
             style: _labelStyle,
             children: children
           )
         ]
       ),
       highlight ? _highlightStyle : _style
     );
   }
 }