Revert "DEV: Import MessageBus from message-bus-client instead of globals"

This reverts commit 9dddbcc00d.

app/assets/javascripts/admin/models/backup.js

@@ -2,7 +2,6 @@ import I18n from "I18n";
 import { ajax } from "discourse/lib/ajax";
 import { extractError } from "discourse/lib/ajax-error";
 import EmberObject from "@ember/object";
-import MessageBus from "message-bus-client";
 
 const Backup = EmberObject.extend({
   destroy() {
@@ -12,7 +11,7 @@ const Backup = EmberObject.extend({
   restore() {
     return ajax("/admin/backups/" + this.filename + "/restore", {
       type: "POST",
-      data: { client_id: MessageBus.clientId }
+      data: { client_id: window.MessageBus.clientId }
     });
   }
 });
@@ -39,7 +38,7 @@ Backup.reopenClass({
       type: "POST",
       data: {
         with_uploads: withUploads,
-        client_id: MessageBus.clientId
+        client_id: window.MessageBus.clientId
       }
     }).then(result => {
       if (!result.success) {

app/assets/javascripts/discourse/app/pre-initializers/inject-discourse-objects.js

@@ -9,7 +9,6 @@ import TopicTrackingState, {
 import ScreenTrack from "discourse/lib/screen-track";
 import Site from "discourse/models/site";
 import User from "discourse/models/user";
-import MessageBus from "message-bus-client";
 
 const ALL_TARGETS = ["controller", "component", "route", "model", "adapter"];
 
@@ -28,7 +27,8 @@ export default {
       ALL_TARGETS.forEach(t => app.inject(t, "store", "service:store"));
     }
 
-    app.register("message-bus:main", MessageBus, { instantiate: false });
+    const messageBus = window.MessageBus;
+    app.register("message-bus:main", messageBus, { instantiate: false });
 
     ALL_TARGETS.concat("service").forEach(t =>
       app.inject(t, "messageBus", "message-bus:main")
@@ -39,7 +39,7 @@ export default {
     app.currentUser = currentUser;
 
     const topicTrackingState = TopicTrackingState.create({
-      messageBus: MessageBus,
+      messageBus,
       currentUser
     });
     app.register("topic-tracking-state:main", topicTrackingState, {

app/assets/javascripts/ember-shim.js

@@ -12,7 +12,3 @@ define("ember", ["exports"], function(__exports__) {
 
   __exports__.default = Ember;
 });
-
-define("message-bus-client", ["exports"], function(__exports__) {
-  __exports__.default = window.MessageBus;
-});

app/assets/javascripts/ember_jquery.js

@@ -3,3 +3,4 @@
 //= require jquery
 //= require ember_include
 //= require discourse-loader
+//= require ember-shim

app/assets/javascripts/vendor.js

@@ -29,4 +29,3 @@
 //= require virtual-dom
 //= require virtual-dom-amd
 //= require intersection-observer
-//= require discourse-shims

app/assets/javascripts/wizard/test/test_helper.js

@@ -12,7 +12,7 @@
 //= require ember-template-compiler
 //= require qunit/qunit/qunit
 //= require ember-qunit
-//= require discourse-shims
+//= require ember-shim
 //= require wizard-application
 //= require wizard-vendor
 //= require helpers/assertions