[MD settings] add proper formatting for appearance setting of homepage as new tab page

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

 <link rel="import" href="chrome://resources/polymer/v1_0/polymer/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/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">
@@ skipping 34 matching lines @@
             <paper-button on-tap="resetTheme_"
                 >[[i18n('resetToDefaultTheme')]]</paper-button>
           </template>
         </div>
         <div class="settings-box split two-line">
           <settings-checkbox class="start" i18n-values="label:showHomeButton"
               pref="{{prefs.browser.show_home_button}}">
           </settings-checkbox>
         </div>
         <template is="dom-if" if="[[prefs.browser.show_home_button.value]]">
-          <settings-radio-group pref="{{prefs.homepage_is_newtabpage}}">
-            <paper-radio-button name="true"
-                >[[i18n('homePageNtp')]]</paper-radio-button>
-            <paper-radio-button name="false"
-                >[[i18n('other')]]</paper-radio-button>
-          </settings-radio-group>
-          <div class="radio-extended">
-            <settings-input no-label-float pref="{{prefs.homepage}}"
-                label="[[i18n('exampleDotCom')]]">
-            </settings-input>
+          <div class="list-frame">
+            <settings-radio-group pref="{{prefs.homepage_is_newtabpage}}">
+              <paper-radio-button class="list-item" name="true">
+                 [[i18n('homePageNtp')]]
+              </paper-radio-button>
+              <paper-radio-button class="list-item" name="false">
+                [[i18n('other')]]
+                <settings-input no-label-float pref="{{prefs.homepage}}"
+                    label="[[i18n('exampleDotCom')]]">
+                </settings-input>
+              </paper-radio-button>
+            </settings-radio-group>
           </div>
         </template>
         <div class="settings-box split">
           <settings-checkbox class="start" i18n-values="label:showBookmarksBar"
               pref="{{prefs.bookmark_bar.show_on_all_tabs}}">
           </settings-checkbox>
         </div>
         <div class="settings-box split">
           <div class="start" i18n-content="fontSize"></div>
           <settings-dropdown-menu id="defaultFontSize"
@@ skipping 20 matching lines @@
         <template is="dom-if" if="[[showFontsPage_(currentRoute.subpage.*)]]"
             restamp>
           <settings-appearance-fonts-page prefs="{{prefs}}">
           </settings-appearance-fonts-page>
         </template>
       </neon-animatable>
     </settings-animated-pages>
   </template>
   <script src="appearance_page.js"></script>
 </dom-module>