Kill ObservableMixin, EmberObject no longer uses mixins!

Author: wagenet

broccoli/amd-compat-entrypoints/ember.debug.js

@@ -227,9 +227,6 @@ d('@ember/object/lib/computed/computed_macros', emberObjectLibComputedComputedMa
 import * as emberObjectMixin from '@ember/object/mixin';
 d('@ember/object/mixin', emberObjectMixin);
 
-import * as emberObjectObservable from '@ember/object/observable';
-d('@ember/object/observable', emberObjectObservable);
-
 import * as emberObjectObservers from '@ember/object/observers';
 d('@ember/object/observers', emberObjectObservers);
 

package.json

@@ -263,7 +263,6 @@
       "@ember/object/lib/computed/computed_macros.js": "ember-source/@ember/object/lib/computed/computed_macros.js",
       "@ember/object/lib/computed/reduce_computed_macros.js": "ember-source/@ember/object/lib/computed/reduce_computed_macros.js",
       "@ember/object/mixin.js": "ember-source/@ember/object/mixin.js",
-      "@ember/object/observable.js": "ember-source/@ember/object/observable.js",
       "@ember/object/observers.js": "ember-source/@ember/object/observers.js",
       "@ember/owner/index.js": "ember-source/@ember/owner/index.js",
       "@ember/renderer/index.js": "ember-source/@ember/renderer/index.js",

packages/@ember/-internals/views/lib/system/event_dispatcher.ts

@@ -350,13 +350,13 @@ export default class EventDispatcher extends EmberObject {
 
   destroy() {
     if (this._didSetup === false) {
-      return;
+      return this;
     }
 
     let rootElement = this._sanitizedRootElement;
 
     if (!rootElement) {
-      return;
+      return this;
     }
 
     for (let event in this._eventHandlers) {
@@ -365,7 +365,7 @@ export default class EventDispatcher extends EmberObject {
 
     rootElement.classList.remove(ROOT_ELEMENT_CLASS);
 
-    return this._super(...arguments);
+    return super.destroy();
   }
 
   toString() {