[MD settings] removing a11y_page.css to unify settings styles further

chrome/browser/resources/settings/bluetooth_page/bluetooth_page.html

 <link rel="import" href="chrome://resources/polymer/v1_0/polymer/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-collapse/iron-collapse.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-icons/device-icons.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-list/iron-list.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-toggle-button/paper-toggle-button.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://md-settings/settings_page/settings_animated_pages.html">
 <link rel="import" href="bluetooth_device_list_item.html">
 <link rel="import" href="bluetooth_add_device_dialog.html">
 <link rel="import" href="bluetooth_pair_device_dialog.html">
 
 <dom-module id="settings-bluetooth-page">
   <link rel="import" type="css" href="chrome://md-settings/settings_shared.css">
   <link rel="import" type="css" href="bluetooth_page.css">
   <template>
     <settings-animated-pages id="pages" current-route="{{currentRoute}}"
         section="bluetooth">
       <neon-animatable id="main">
-        <div class="settings-box">
+        <div class="settings-box first">
           <div class="layout horizontal center">
             <iron-icon icon="device:bluetooth"></iron-icon>
             <span class="flex" i18n-content="bluetoothEnable"></span>
             <cr-expand-button id="expandListButton"
                 hidden$="[[!bluetoothEnabled]]"
                 expanded="{{deviceListExpanded}}">
             </cr-expand-button>
             <paper-toggle-button id="enableBluetooth"
                 checked="{{bluetoothEnabled}}"
                 on-change="onBluetoothEnabledChange_">
@@ skipping 43 matching lines @@
             pairing-event="[[pairingEvent]]"
             on-response="onResponse_"
             on-close-dialog="onCloseDialog_">
         </settings-bluetooth-pair-device-dialog>
       </template>
     </paper-dialog>
 
   </template>
   <script src="bluetooth_page.js"></script>
 </dom-module>