Add ES6 support to more files

app/assets/javascripts/admin/controllers/admin-email-sent.js.es6

@@ -1,8 +1,9 @@
 import DiscourseController from 'discourse/controllers/controller';
+import debounce from 'discourse/lib/debounce';
 
 export default DiscourseController.extend({
 
-  filterEmailLogs: Discourse.debounce(function() {
+  filterEmailLogs: debounce(function() {
     var self = this;
     Discourse.EmailLog.findAll(this.get("filter")).then(function(logs) {
       self.set("model", logs);

app/assets/javascripts/admin/controllers/admin-email-skipped.js.es6

@@ -1,7 +1,8 @@
+import debounce from 'discourse/lib/debounce';
 import DiscourseController from 'discourse/controllers/controller';
 
 export default DiscourseController.extend({
-  filterEmailLogs: Discourse.debounce(function() {
+  filterEmailLogs: debounce(function() {
     var self = this;
     Discourse.EmailLog.findAll(this.get("filter")).then(function(logs) {
       self.set("model", logs);

app/assets/javascripts/admin/controllers/admin-logs-screened-ip-addresses.js.es6

@@ -1,3 +1,4 @@
+import debounce from 'discourse/lib/debounce';
 import { outputExportResult } from 'discourse/lib/export-result';
 import { exportEntity } from 'discourse/lib/export-csv';
 
@@ -6,7 +7,7 @@ export default Ember.ArrayController.extend({
   itemController: 'admin-log-screened-ip-address',
   filter: null,
 
-  show: Discourse.debounce(function() {
+  show: debounce(function() {
     var self = this;
     self.set('loading', true);
     Discourse.ScreenedIpAddress.findAll(this.get("filter")).then(function(result) {

app/assets/javascripts/admin/controllers/admin-permalinks.js.es6

@@ -1,8 +1,10 @@
+import debounce from 'discourse/lib/debounce';
+
 export default Ember.ArrayController.extend({
   loading: false,
   filter: null,
 
-  show: Discourse.debounce(function() {
+  show: debounce(function() {
     var self = this;
     self.set('loading', true);
     Discourse.Permalink.findAll(self.get("filter")).then(function(result) {

app/assets/javascripts/admin/controllers/admin-site-settings.js.es6

@@ -1,3 +1,4 @@
+import debounce from 'discourse/lib/debounce';
 import Presence from 'discourse/mixins/presence';
 
 export default Ember.ArrayController.extend(Presence, {
@@ -50,7 +51,7 @@ export default Ember.ArrayController.extend(Presence, {
     this.transitionToRoute("adminSiteSettingsCategory", category || "all_results");
   },
 
-  filterContent: Discourse.debounce(function() {
+  filterContent: debounce(function() {
     if (this.get("_skipBounce")) {
       this.set("_skipBounce", false);
     } else {

app/assets/javascripts/admin/controllers/admin-users-list-show.js.es6

@@ -1,3 +1,4 @@
+import debounce from 'discourse/lib/debounce';
 import { i18n } from 'discourse/lib/computed';
 
 export default Ember.ArrayController.extend({
@@ -33,7 +34,7 @@ export default Ember.ArrayController.extend({
     return I18n.t('admin.users.titles.' + this.get('query'));
   }.property('query'),
 
-  _filterUsers: Discourse.debounce(function() {
+  _filterUsers: debounce(function() {
     this._refreshUsers();
   }, 250).observes('listFilter'),