ChromeOS OOBE: Fix language and keyboard md-select look.

chrome/browser/resources/chromeos/login/oobe_welcome.html

 <!-- Copyright 2016 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. -->
 
 <link rel="import" href="chrome://resources/cr_elements/network/cr_network_icon.html">
 <link rel="import" href="chrome://resources/cr_elements/network/cr_network_select.html">
 <link rel="import" href="chrome://resources/cr_elements/network/cr_onc_types.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/classes/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-iconset-svg/iron-iconset-svg.html">
@@ skipping 86 matching lines @@
         i18n-values="aria-label:languageSectionTitle">
       <hd-iron-icon class="oobe-icon"
           icon1x="oobe-welcome-32:language" icon2x="oobe-welcome-64:language">
       </hd-iron-icon>
       <div class="header">
         <h1 class="title" i18n-content="languageSectionTitle"></h1>
       </div>
       <div class="footer layout vertical">
         <template is="dom-if" if="[[enabled]]">
           <div id="languageDropdownContainer"
-              class="flex layout horizontal justified language-selection-entry">
+              class="flex layout center horizontal justified
+                  language-selection-entry">
             <div class="language-selection-title layout vertical center-justified"
                 i18n-content="languageDropdownTitle">
             </div>
             <oobe-i18n-dropdown id="languageSelect" items="[[languages]]"
                 on-select-item="onLanguageSelected_"
                 class="focus-on-show"
                 i18n-values="label-for-aria:languageDropdownLabel">
             </oobe-i18n-dropdown>
           </div>
           <div id="keyboardDropdownContainer"
-              class="flex layout horizontal justified language-selection-entry">
+              class="flex layout center horizontal justified
+                 language-selection-entry">
             <div class="language-selection-title layout vertical center-justified"
                 i18n-content="keyboardDropdownTitle">
             </div>
             <oobe-i18n-dropdown id="keyboardSelect" items="[[keyboards]]"
                 on-select-item="onKeyboardSelected_"
                 i18n-values="label-for-aria:keyboardDropdownLabel">
             </oobe-i18n-dropdown>
           </div>
         </template>
       </div>
@@ skipping 74 matching lines @@
     </oobe-dialog>
     <oobe-dialog id="timezoneScreen" role="dialog" hidden has-buttons
         i18n-values="aria-label:timezoneSectionTitle">
       <hd-iron-icon class="oobe-icon"
           icon1x="oobe-welcome-32:timezone" icon2x="oobe-welcome-64:timezone">
       </hd-iron-icon>
       <div class="header">
         <h1 class="title" i18n-content="timezoneSectionTitle"></h1>
       </div>
       <div class="footer layout vertical">
-        <div class="flex layout horizontal justified timezone-selection-entry">
+        <div class="flex layout center horizontal justified
+              timezone-selection-entry">
           <div class="timezone-selection-title layout vertical center-justified"
               i18n-content="timezoneDropdownTitle">
           </div>
           <oobe-i18n-dropdown id="timezoneSelect" items="[[timezones]]"
               on-select-item="onTimezoneSelected_"
               i18n-values="label-for-aria:timezoneDropdownLabel"
               class="focus-on-show">
           </oobe-i18n-dropdown>
         </div>
       </div>
@@ skipping 26 matching lines @@
       <div class="bottom-buttons layout horizontal justified">
         <oobe-back-button on-tap="onNetworkSelectionBackButtonPressed_">
         </oobe-back-button>
         <oobe-next-button disabled="[[!isConnected_]]"
             on-tap="onSelectedNetworkConnected_">
         </oobe-next-button>
       </div>
     </oobe-dialog>
   </template>
 </dom-module>