MD Settings: Restore Search engines table headers.

chrome/browser/resources/settings/search_engines_page/search_engines_list.html

 <link rel="import" href="chrome://resources/cr_elements/shared_style_css.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-list/iron-list.html">
 <link rel="import" href="../global_scroll_target_behavior.html">
+<link rel="import" href="../settings_vars_css.html">
 <link rel="import" href="search_engine_entry.html">
 
 <dom-module id="settings-search-engines-list">
   <template>
     <style include="cr-shared-style">
       .headers {
         display: flex;
         padding: 10px 0;
       }
 
       .headers .name,
       .headers .keyword {
         flex: 3;
       }
 
       .headers .url {
-        flex: 4.5;
+        flex: 4;
       }
 
       div#outer {
         @apply(--settings-list-frame-padding);
       }
 
       settings-search-engine-entry {
         border-top: var(--settings-separator-line);
       }
 
-      settings-search-engine-entry:first-of-type {
-        border-top: none;
+      .icon-placeholder {
+        width: calc(var(--iron-icon-width) + 2 * 10px);
       }
     </style>
     <div id="outer">
-      <content></content>
+      <div class="headers" hidden$="[[hideHeaders]]">
+        <div class="name">$i18n{searchEnginesSearchEngine}</div>
+        <div class="keyword">$i18n{searchEnginesKeyword}</div>
+        <div class="url">$i18n{searchEnginesQueryURL}</div>
+        <div class="icon-placeholder"></div>
+      </div>
       <div id="container" class="scroll-container">
         <iron-list items="[[engines]]" scroll-target="[[subpageScrollTarget]]">
           <template>
             <settings-search-engine-entry engine="[[item]]"
                 tabindex$="[[tabIndex]]">
             </settings-search-engine-entry>
           </template>
         </iron-list>
       </div>
     </div>
   </template>
   <script src="search_engines_list.js"></script>
 </dom-module>