Remove all uses of display:block and display:inline-block.

sky/framework/elements/sky-menu-item.sky

 <!--
 // 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 src="sky-element.sky" />
 <import src="material-element.sky" />
 <import src="sky-icon.sky" />
 
 <sky-element attributes="icon:string">
 <template>
   <style>
     :host {
       display: flex;
+      flex-direction: row;
       align-items: center;
       height: 48px;
       -webkit-user-select: none;
     }
     #background {
       display: flex;
+      flex-direction: row;
       align-items: center;
       height: 100%;
       flex: 1;
     }
     #background[highlight] {
       background: rgba(153, 153, 153, 0.4);
     }
     sky-icon {
       padding: 0px 16px;
     }
@@ skipping 40 matching lines @@
   }
 
   void _handlePointerUp(Event event) {
     shadowRoot.getElementById('background').removeAttribute('highlight');
   }
 }
 
 _init(script) => register(script, SkyMenuItem);
 </script>
 </sky-element>