[MD settings] edit content settings exceptions

chrome/browser/resources/settings/site_settings/site_list.html

 <link rel="import" href="chrome://resources/cr_elements/cr_action_menu/cr_action_menu.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="../i18n_setup.html">
 <link rel="import" href="../icons.html">
 <link rel="import" href="../route.html">
 <link rel="import" href="../settings_shared_css.html">
@@ skipping 32 matching lines @@
         <button class="dropdown-item" role="option" id="block"
             on-tap="onBlockTap_" hidden$="[[!showBlockAction_]]">
           $i18n{siteSettingsActionBlock}
         </button>
         <button class="dropdown-item" role="option" id="sessionOnly"
             on-tap="onSessionOnlyTap_"
             hidden$="[[!showSessionOnlyActionForSite_(actionMenuSite_)]]">
           $i18n{siteSettingsActionSessionOnly}
         </button>
         <button class="dropdown-item" role="option" id="edit"
-            on-tap="onEditTap_" hidden$="[[!showEditAction_]]">
+            on-tap="onEditTap_">
           $i18n{edit}
         </button>
         <button class="dropdown-item" role="option" id="reset"
             on-tap="onResetTap_">
           $i18n{siteSettingsActionReset}
         </button>
       </dialog>
 
       <div class="list-frame" hidden$="[[hasSites_(sites)]]">
         <div class="list-item secondary">$i18n{noSitesAdded}</div>
       </div>
       <div class="list-frame menu-content vertical-list" id="listContainer">
         <template is="dom-repeat" items="[[sites]]">
-          <div class="list-item" actionable$="[[enableSiteSettings_]]" on-tap="onOriginTap_">
+          <div class="list-item" actionable$="[[enableSiteSettings_]]"
+              on-tap="onOriginTap_">
             <div class="favicon-image"
                 style$="[[computeSiteIcon(item.origin)]]">
             </div>
             <div class="middle no-min-width">
               <div class="selectable text-elide">[[item.displayName]]</div>
 
               <!-- This div must not contain extra whitespace. -->
               <div class="selectable secondary text-elide" id="siteDescription"
                   >[[computeSiteDescription_(item)]]</div>
             </div>
@@ skipping 18 matching lines @@
       </div>
     </div>
     <template is="dom-if" if="[[showEditExceptionDialog_]]" restamp>
       <settings-edit-exception-dialog model="[[actionMenuSite_]]"
           on-close="onEditExceptionDialogClosed_">
       </settings-edit-exception-dialog>
     </template>
   </template>
   <script src="site_list.js"></script>
 </dom-module>