MD Settings: Focus cookies search field when exiting cookie details subpage.

chrome/browser/resources/settings/privacy_page/privacy_page.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_dialog/cr_dialog.html">
 <link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_vars_css.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/iron-flex-layout-classes.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="../clear_browsing_data_dialog/clear_browsing_data_dialog.html">
@@ skipping 269 matching lines @@
           <div class="settings-box two-line">
             <settings-toggle-button class="start"
                 pref="{{prefs.profile.block_third_party_cookies}}"
                 label="$i18n{thirdPartyCookie}"
                 sub-label="$i18n{thirdPartyCookieSublabel}">
             </settings-toggle-button>
           </div>
           <category-setting-exceptions
               category="{{ContentSettingsTypes.COOKIES}}">
           </category-setting-exceptions>
-          <site-data></site-data>
+          <site-data focus-config="[[focusConfig_]]"></site-data>
         </settings-subpage>
       </template>
       <template is="dom-if" route-path="/content/images" no-search>
         <settings-subpage page-title="$i18n{siteSettingsCategoryImages}">
           <category-default-setting category="{{ContentSettingsTypes.IMAGES}}"
               toggle-off-label="$i18n{siteSettingsDontShowImages}"
               toggle-on-label="$i18n{siteSettingsShowAllRecommended}">
           </category-default-setting>
           <category-setting-exceptions
               category="{{ContentSettingsTypes.IMAGES}}">
@@ skipping 189 matching lines @@
                 category="{{ContentSettingsTypes.PROTECTED_CONTENT}}">
             </category-setting-exceptions>
           </template>
 </if>
         </settings-subpage>
       </template>
     </settings-animated-pages>
   </template>
   <script src="privacy_page.js"></script>
 </dom-module>