MD Settings: fix some dynamically bound aria-labels

chrome/browser/resources/settings/search_page/search_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/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="../controls/extension_controlled_indicator.html">
 <link rel="import" href="../controls/settings_toggle_button.html">
 <link rel="import" href="../icons.html">
 <link rel="import" href="../i18n_setup.html">
@@ skipping 94 matching lines @@
             <div class="settings-box two-line continuation indented"
                 on-tap="onManageAudioHistoryTap_" actionable>
               <div class="start">
                 [[i18n('searchOkGoogleAudioHistoryLabel',
                        hotwordInfo_.userName)]]
                 <div class="secondary" id="audioHistorySecondary">
                   $i18n{searchOkGoogleAudioHistorySubtext}
                 </div>
               </div>
               <button class="icon-external" is="paper-icon-button-light"
-                  aria-label="[[i18n('searchOkGoogleAudioHistoryLabel',
-                                     hotwordInfo_.userName)]]"
+                  aria-label$="[[i18n('searchOkGoogleAudioHistoryLabel',
+                                      hotwordInfo_.userName)]]"
                   aria-describedby="audioHistorySecondary"></button>
             </div>
           </template>
         </template>
 
         <!-- Manage search engines -->
         <div id="subpage-trigger" class="settings-box two-line"
             on-tap="onManageSearchEnginesTap_" actionable>
           <div class="start">
             $i18n{searchEnginesManage}
@@ skipping 10 matching lines @@
         <settings-subpage
             associated-control="[[$$('#subpage-trigger')]]"
             page-title="$i18n{searchEnginesManage}">
           <settings-search-engines-page></settings-search-engines-page>
         </settings-subpage>
       </template>
     </settings-animated-pages>
   </template>
   <script src="search_page.js"></script>
 </dom-module>