remove the use of unused API_HOST

Author: mansona

app/routes/application.js

@@ -52,7 +52,6 @@ export default class ApplicationRoute extends Route {
   };
 
   async afterModel() {
-    set(this, 'headData.cdnDomain', ENV.API_HOST);
     await this.legacyModuleMappings.initMappings();
     return super.afterModel(...arguments);
   }

app/services/head-data.js

@@ -8,5 +8,4 @@ export default class HeadDataService extends Service {
   @tracked urlVersion;
   @tracked canonicalUrl;
   @tracked description;
-  @tracked cdnDomain;
 }

app/templates/head.hbs

@@ -1,5 +1,3 @@
-<link rel="dns-prefetch" href="{{this.model.cdnDomain}}">
-
 {{#if this.model.description}}
   <meta name="description" content={{this.model.description}}>
   <meta property="og:description" content={{this.model.description}}>

config/environment.js

@@ -12,7 +12,6 @@ module.exports = function (environment) {
     rootURL: '/',
     routerRootURL: '/',
     locationType: 'history',
-    API_HOST: process.env.API_HOST || 'https://api-store.emberjs.com',
     EmberENV: {
       EXTEND_PROTOTYPES: false,
       FEATURES: {

package.json

@@ -25,7 +25,6 @@
     "lint:hbs:fix": "ember-template-lint . --fix",
     "lint:js": "eslint . --cache",
     "lint:js:fix": "eslint . --fix",
-    "start:local": "API_HOST=http://localhost:5050 ember serve",
     "start": "ember serve",
     "test:ember": "ember test"
   },

tests/acceptance/head-test.js

@@ -25,18 +25,4 @@ module('Acceptance | head', function (hooks) {
     await visit('/');
     assert.dom('link[rel=canonical]', this.head).doesNotExist();
   });
-
-  test('dns prefetch should be populated', async function (assert) {
-    await visit('/ember/release/classes/Application');
-    assert
-      .dom('link[rel=dns-prefetch]', this.head)
-      .hasAttribute('href', ENV.API_HOST);
-  });
-
-  test('dns prefetch should be populated when root url visited', async function (assert) {
-    await visit('/');
-    assert
-      .dom('link[rel=dns-prefetch]', this.head)
-      .hasAttribute('href', ENV.API_HOST);
-  });
 });