MD Settings: fix settings-toggle-button label text overflow.

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/md_select_css.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/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-light.html">
 <link rel="import" href="/appearance_page/appearance_browser_proxy.html">
 <link rel="import" href="/controls/controlled_radio_button.html">
 <link rel="import" href="/controls/extension_controlled_indicator.html">
@@ skipping 73 matching lines @@
               <paper-button id="useSystem" on-tap="onUseSystemTap_"
                   class="secondary-button">
                 $i18n{useSystemTheme}
               </paper-button>
             </template>
           </div>
 </if>
         </div>
         <div class="settings-box"
             hidden="[[!pageVisibility.homeButton]]">
-          <settings-toggle-button class="start"
+          <settings-toggle-button class="start" elide-label
               pref="{{prefs.browser.show_home_button}}"
               label="$i18n{showHomeButton}"
               sub-label="[[getShowHomeSubLabel_(
                   prefs.homepage_is_newtabpage.value, prefs.homepage.value)]]">
           </settings-toggle-button>
         </div>
         <template is="dom-if" if="[[prefs.browser.show_home_button.value]]">
           <div class="list-frame"
               hidden="[[!pageVisibility.homeButton]]">
             <settings-radio-group pref="{{prefs.homepage_is_newtabpage}}">
@@ skipping 78 matching lines @@
             associated-control="[[$$('#customize-fonts-subpage-trigger')]]"
             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>