MD Settings: polish top-level bluetooth page

chrome/browser/resources/settings/appearance_page/appearance_page.html

 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/polymer.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-icons/device-icons.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icons/image-icons.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-radio-button/paper-radio-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-toggle-button/paper-toggle-button.html">
 <link rel="import" href="chrome://md-settings/controls/settings_dropdown_menu.html">
 <link rel="import" href="chrome://md-settings/controls/settings_input.html">
 <link rel="import" href="chrome://md-settings/controls/settings_radio_group.html">
 <link rel="import" href="chrome://md-settings/settings_page/settings_animated_pages.html">
 <link rel="import" href="chrome://md-settings/settings_page/settings_subpage.html">
 <link rel="import" href="chrome://md-settings/settings_shared_css.html">
 <link rel="import" href="appearance_fonts_page.html">
 
 <dom-module id="settings-appearance-page">
   <link rel="import" type="css"
       href="chrome://md-settings/appearance_page/appearance_shared.css">
   <link rel="import" type="css" href="chrome://resources/css/widgets.css">
   <link rel="import" href="chrome://resources/html/action_link.html">
   <template>
     <style include="settings-shared">
       .settings-box iron-icon {
-        -webkit-margin-end: var(--checkbox-spacing);

[Dan Beam, 2016/04/12 04:28:13]

this was subtly wrong (<paper-checkbox> is 16x16, <iron-icon> is 20x20)

+        -webkit-margin-end: var(--iron-icon-spacing);
       }
     </style>
     <settings-animated-pages id="pages" current-route="{{currentRoute}}"
         section="appearance">
       <neon-animatable id="main">
 <if expr="chromeos">
         <div class="settings-box first two-line">
           <iron-icon icon="device:wallpaper"></iron-icon>
           <div class="start">
             <div>[[i18n('setWallpaper')]]</div>
@@ skipping 64 matching lines @@
       <template is="dom-if" name="appearance-fonts">
         <settings-subpage page-title="[[i18n('customizeFonts')]]">
           <settings-appearance-fonts-page prefs="{{prefs}}">
           </settings-appearance-fonts-page>
         </settings-subpage>
       </template>
     </settings-animated-pages>
   </template>
   <script src="appearance_page.js"></script>
 </dom-module>