[CLEANUP beta] Remove support for global DS variable (#5287)

(cherry picked from commit 4c2eca6)

addon/-private/index.js

@@ -27,8 +27,6 @@ export { getOwner, modelHasAttributeOrRelationshipNamedType } from './utils';
 export { default as coerceId } from './system/coerce-id';
 export { default as parseResponseHeaders } from './utils/parse-response-headers';
 
-// should be private ?
-export { default as global } from './global';
 export { default as isEnabled } from './features';
 // `ember-data-model-fragments` relies on `RootState` and `InternalModel`
 export { default as RootState } from './system/model/states';

addon/index.js

@@ -1,6 +1,5 @@
 import EmberError from '@ember/error';
 import Ember from "ember";
-import { deprecate } from '@ember/debug';
 
 /**
   Ember Data
@@ -22,7 +21,6 @@ import {
   BuildURLMixin,
   belongsTo,
   hasMany,
-  global,
   Errors,
   RootState,
   Model,
@@ -145,18 +143,4 @@ Object.defineProperty(DS, 'normalizeModelName', {
   value: normalizeModelName
 });
 
-Object.defineProperty(global, 'DS', {
-  configurable: true,
-  get() {
-    deprecate(
-      'Using the global version of DS is deprecated. Please either import ' +
-        'the specific modules needed or `import DS from \'ember-data\';`.',
-      false,
-      { id: 'ember-data.global-ds', until: '3.0.0' }
-    );
-
-    return DS;
-  }
-});
-
 export default DS;