MD Settings: Add "Show Google Now cards in the launcher" row in Search section.

chrome/browser/resources/settings/basic_page/basic_page.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="/appearance_page/appearance_page.html">
 <link rel="import" href="/search_page/search_page.html">
 <link rel="import" href="/settings_page/main_page_behavior.html">
 <link rel="import" href="/settings_page/settings_page_visibility.html">
 <link rel="import" href="/settings_page/settings_section.html">
 <link rel="import" href="/on_startup_page/on_startup_page.html">
 <link rel="import" href="/people_page/people_page.html">
 <link rel="import" href="/reset_page/reset_profile_banner.html">
 <link rel="import" href="/settings_page_css.html">
@@ skipping 41 matching lines @@
       </template>
 <if expr="chromeos">
       <template is="dom-if" if="[[showPage(pageVisibility.device)]]" restamp>
         <settings-section page-title="$i18n{devicePageTitle}" section="device">
           <settings-device-page prefs="{{prefs}}"></settings-device-page>
         </settings-section>
       </template>
 </if>
       <template is="dom-if" if="[[showPage(pageVisibility.search)]]" restamp>
         <settings-section page-title="$i18n{searchPageTitle}" section="search">
-          <settings-search-page prefs="[[prefs]]"></settings-search-page>
+          <settings-search-page prefs="{{prefs}}"></settings-search-page>
         </settings-section>
       </template>
 <if expr="chromeos">
       <template is="dom-if"
           if="[[shouldShowAndroidApps_(showAndroidApps, pageVisibility)]]"
           restamp>
         <settings-section page-title="$i18n{androidAppsPageTitle}"
             section="androidApps">
           <settings-android-apps-page prefs="{{prefs}}">
           </settings-android-apps-page>
@@ skipping 12 matching lines @@
       <template is="dom-if" if="[[showPage(pageVisibility.onStartup)]]" restamp>
         <settings-section page-title="$i18n{onStartup}" section="onStartup">
           <settings-on-startup-page prefs="{{prefs}}">
           </settings-on-startup-page>
         </settings-section>
       </template>
     </div>
   </template>
   <script src="basic_page.js"></script>
 </dom-module>