Site Settings Desktop: Implement protocol handler section.

chrome/browser/resources/settings/privacy_page/privacy_page.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="/clear_browsing_data_dialog/clear_browsing_data_dialog.html">
 <link rel="import" href="/controls/settings_checkbox.html">
 <link rel="import" href="/settings_main/settings_main_rendered.html">
 <link rel="import" href="/settings_page/settings_animated_pages.html">
 <link rel="import" href="/settings_page/settings_subpage.html">
 <link rel="import" href="/settings_shared_css.html">
 <link rel="import" href="/site_settings/all_sites.html">
 <link rel="import" href="/site_settings/constants.html">
 <link rel="import" href="/site_settings/media_picker.html">
+<link rel="import" href="/site_settings/protocol_handlers.html">
 <link rel="import" href="/site_settings_page/site_settings_page.html">
 
 <if expr="use_nss_certs">
 <link rel="import" href="/certificate_manager_page/certificate_manager_page.html">
 </if>
 <if expr="is_win or is_macosx">
 <link rel="import" href="/privacy_page/privacy_page_browser_proxy.html">
 </if>
 
 <dom-module id="settings-privacy-page">
@@ skipping 169 matching lines @@
       </template>
       <template is="dom-if" name="site-settings-category-location">
         <settings-subpage page-title="$i18n{siteSettingsCategoryLocation}">
           <site-settings-category
               selected-site="{{selectedSite}}"
               current-route="{{currentRoute}}"
               category="{{ContentSettingsTypes.GEOLOCATION}}">
           </site-settings-category>
         </settings-subpage>
       </template>
+      <template is="dom-if" name="protocol-handlers">
+        <settings-subpage page-title="$i18n{siteSettingsCategoryHandlers}">
+          <protocol-handlers></protocol-handlers>
+        </settings-subpage>
+      </template>
       <template is="dom-if" name="site-settings-category-javascript">
         <settings-subpage
             page-title="$i18n{siteSettingsCategoryJavascript}">
           <site-settings-category
               selected-site="{{selectedSite}}"
               current-route="{{currentRoute}}"
               category="{{ContentSettingsTypes.JAVASCRIPT}}">
           </site-settings-category>
         </settings-subpage>
       </template>
@@ skipping 58 matching lines @@
       <template is="dom-if" name="site-details">
         <settings-subpage
             page-title="$i18n{siteSettingsSiteDetailsPageTitle}">
           <site-details site="[[selectedSite]]"></site-details>
         </settings-subpage>
       </template>
     </settings-animated-pages>
   </template>
   <script src="privacy_page.js"></script>
 </dom-module>